includes/EditPage.php

   1 <?php
   2 /**
   3  * User interface for page editing.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * The edit page/HTML interface (split from Article)
  25  * The actual database and text munging is still in Article,
  26  * but it should get easier to call those from alternate
  27  * interfaces.
  28  *
  29  * EditPage cares about two distinct titles:
  30  * $this->mContextTitle is the page that forms submit to, links point to,
  31  * redirects go to, etc. $this->mTitle (as well as $mArticle) is the
  32  * page in the database that is actually being edited. These are
  33  * usually the same, but they are now allowed to be different.
  34  *
  35  * Surgeon General's Warning: prolonged exposure to this class is known to cause
  36  * headaches, which may be fatal.
  37  */
  38 class EditPage {
  39         /**
  40          * Status: Article successfully updated
  41          */
  42         const AS_SUCCESS_UPDATE = 200;
  43
  44         /**
  45          * Status: Article successfully created
  46          */
  47         const AS_SUCCESS_NEW_ARTICLE = 201;
  48
  49         /**
  50          * Status: Article update aborted by a hook function
  51          */
  52         const AS_HOOK_ERROR = 210;
  53
  54         /**
  55          * Status: A hook function returned an error
  56          */
  57         const AS_HOOK_ERROR_EXPECTED = 212;
  58
  59         /**
  60          * Status: User is blocked from editing this page
  61          */
  62         const AS_BLOCKED_PAGE_FOR_USER = 215;
  63
  64         /**
  65          * Status: Content too big (> $wgMaxArticleSize)
  66          */
  67         const AS_CONTENT_TOO_BIG = 216;
  68
  69         /**
  70          * Status: this anonymous user is not allowed to edit this page
  71          */
  72         const AS_READ_ONLY_PAGE_ANON = 218;
  73
  74         /**
  75          * Status: this logged in user is not allowed to edit this page
  76          */
  77         const AS_READ_ONLY_PAGE_LOGGED = 219;
  78
  79         /**
  80          * Status: wiki is in readonly mode (wfReadOnly() == true)
  81          */
  82         const AS_READ_ONLY_PAGE = 220;
  83
  84         /**
  85          * Status: rate limiter for action 'edit' was tripped
  86          */
  87         const AS_RATE_LIMITED = 221;
  88
  89         /**
  90          * Status: article was deleted while editing and param wpRecreate == false or form
  91          * was not posted
  92          */
  93         const AS_ARTICLE_WAS_DELETED = 222;
  94
  95         /**
  96          * Status: user tried to create this page, but is not allowed to do that
  97          * ( Title->userCan('create') == false )
  98          */
  99         const AS_NO_CREATE_PERMISSION = 223;
 100
 101         /**
 102          * Status: user tried to create a blank page and wpIgnoreBlankArticle == false
 103          */
 104         const AS_BLANK_ARTICLE = 224;
 105
 106         /**
 107          * Status: (non-resolvable) edit conflict
 108          */
 109         const AS_CONFLICT_DETECTED = 225;
 110
 111         /**
 112          * Status: no edit summary given and the user has forceeditsummary set and the user is not
 113          * editing in his own userspace or talkspace and wpIgnoreBlankSummary == false
 114          */
 115         const AS_SUMMARY_NEEDED = 226;
 116
 117         /**
 118          * Status: user tried to create a new section without content
 119          */
 120         const AS_TEXTBOX_EMPTY = 228;
 121
 122         /**
 123          * Status: article is too big (> $wgMaxArticleSize), after merging in the new section
 124          */
 125         const AS_MAX_ARTICLE_SIZE_EXCEEDED = 229;
 126
 127         /**
 128          * Status: WikiPage::doEdit() was unsuccessful
 129          */
 130         const AS_END = 231;
 131
 132         /**
 133          * Status: summary contained spam according to one of the regexes in $wgSummarySpamRegex
 134          */
 135         const AS_SPAM_ERROR = 232;
 136
 137         /**
 138          * Status: anonymous user is not allowed to upload (User::isAllowed('upload') == false)
 139          */
 140         const AS_IMAGE_REDIRECT_ANON = 233;
 141
 142         /**
 143          * Status: logged in user is not allowed to upload (User::isAllowed('upload') == false)
 144          */
 145         const AS_IMAGE_REDIRECT_LOGGED = 234;
 146
 147         /**
 148          * Status: user tried to modify the content model, but is not allowed to do that
 149          * ( User::isAllowed('editcontentmodel') == false )
 150          */
 151         const AS_NO_CHANGE_CONTENT_MODEL = 235;
 152
 153         /**
 154          * Status: user tried to create self-redirect (redirect to the same article) and
 155          * wpIgnoreSelfRedirect == false
 156          */
 157         const AS_SELF_REDIRECT = 236;
 158
 159         /**
 160          * Status: an error relating to change tagging. Look at the message key for
 161          * more details
 162          */
 163         const AS_CHANGE_TAG_ERROR = 237;
 164
 165         /**
 166          * Status: can't parse content
 167          */
 168         const AS_PARSE_ERROR = 240;
 169
 170         /**
 171          * Status: when changing the content model is disallowed due to
 172          * $wgContentHandlerUseDB being false
 173          */
 174         const AS_CANNOT_USE_CUSTOM_MODEL = 241;
 175
 176         /**
 177          * HTML id and name for the beginning of the edit form.
 178          */
 179         const EDITFORM_ID = 'editform';
 180
 181         /**
 182          * Prefix of key for cookie used to pass post-edit state.
 183          * The revision id edited is added after this
 184          */
 185         const POST_EDIT_COOKIE_KEY_PREFIX = 'PostEditRevision';
 186
 187         /**
 188          * Duration of PostEdit cookie, in seconds.
 189          * The cookie will be removed instantly if the JavaScript runs.
 190          *
 191          * Otherwise, though, we don't want the cookies to accumulate.
 192          * RFC 2109 ( https://www.ietf.org/rfc/rfc2109.txt ) specifies a possible
 193          * limit of only 20 cookies per domain. This still applies at least to some
 194          * versions of IE without full updates:
 195          * https://blogs.msdn.com/b/ieinternals/archive/2009/08/20/wininet-ie-cookie-internals-faq.aspx
 196          *
 197          * A value of 20 minutes should be enough to take into account slow loads and minor
 198          * clock skew while still avoiding cookie accumulation when JavaScript is turned off.
 199          */
 200         const POST_EDIT_COOKIE_DURATION = 1200;
 201
 202         /** @var Article */
 203         public $mArticle;
 204         /** @var WikiPage */
 205         private $page;
 206
 207         /** @var Title */
 208         public $mTitle;
 209
 210         /** @var null|Title */
 211         private $mContextTitle = null;
 212
 213         /** @var string */
 214         public $action = 'submit';
 215
 216         /** @var bool */
 217         public $isConflict = false;
 218
 219         /** @var bool */
 220         public $isCssJsSubpage = false;
 221
 222         /** @var bool */
 223         public $isCssSubpage = false;
 224
 225         /** @var bool */
 226         public $isJsSubpage = false;
 227
 228         /** @var bool */
 229         public $isWrongCaseCssJsPage = false;
 230
 231         /** @var bool New page or new section */
 232         public $isNew = false;
 233
 234         /** @var bool */
 235         public $deletedSinceEdit;
 236
 237         /** @var string */
 238         public $formtype;
 239
 240         /** @var bool */
 241         public $firsttime;
 242
 243         /** @var bool|stdClass */
 244         public $lastDelete;
 245
 246         /** @var bool */
 247         public $mTokenOk = false;
 248
 249         /** @var bool */
 250         public $mTokenOkExceptSuffix = false;
 251
 252         /** @var bool */
 253         public $mTriedSave = false;
 254
 255         /** @var bool */
 256         public $incompleteForm = false;
 257
 258         /** @var bool */
 259         public $tooBig = false;
 260
 261         /** @var bool */
 262         public $kblength = false;
 263
 264         /** @var bool */
 265         public $missingComment = false;
 266
 267         /** @var bool */
 268         public $missingSummary = false;
 269
 270         /** @var bool */
 271         public $allowBlankSummary = false;
 272
 273         /** @var bool */
 274         protected $blankArticle = false;
 275
 276         /** @var bool */
 277         protected $allowBlankArticle = false;
 278
 279         /** @var bool */
 280         protected $selfRedirect = false;
 281
 282         /** @var bool */
 283         protected $allowSelfRedirect = false;
 284
 285         /** @var string */
 286         public $autoSumm = '';
 287
 288         /** @var string */
 289         public $hookError = '';
 290
 291         /** @var ParserOutput */
 292         public $mParserOutput;
 293
 294         /** @var bool Has a summary been preset using GET parameter &summary= ? */
 295         public $hasPresetSummary = false;
 296
 297         /** @var bool */
 298         public $mBaseRevision = false;
 299
 300         /** @var bool */
 301         public $mShowSummaryField = true;
 302
 303         # Form values
 304
 305         /** @var bool */
 306         public $save = false;
 307
 308         /** @var bool */
 309         public $preview = false;
 310
 311         /** @var bool */
 312         public $diff = false;
 313
 314         /** @var bool */
 315         public $minoredit = false;
 316
 317         /** @var bool */
 318         public $watchthis = false;
 319
 320         /** @var bool */
 321         public $recreate = false;
 322
 323         /** @var string */
 324         public $textbox1 = '';
 325
 326         /** @var string */
 327         public $textbox2 = '';
 328
 329         /** @var string */
 330         public $summary = '';
 331
 332         /** @var bool */
 333         public $nosummary = false;
 334
 335         /** @var string */
 336         public $edittime = '';
 337
 338         /** @var integer */
 339         private $editRevId = null;
 340
 341         /** @var string */
 342         public $section = '';
 343
 344         /** @var string */
 345         public $sectiontitle = '';
 346
 347         /** @var string */
 348         public $starttime = '';
 349
 350         /** @var int */
 351         public $oldid = 0;
 352
 353         /** @var int */
 354         public $parentRevId = 0;
 355
 356         /** @var string */
 357         public $editintro = '';
 358
 359         /** @var null */
 360         public $scrolltop = null;
 361
 362         /** @var bool */
 363         public $bot = true;
 364
 365         /** @var null|string */
 366         public $contentModel = null;
 367
 368         /** @var null|string */
 369         public $contentFormat = null;
 370
 371         /** @var null|array */
 372         private $changeTags = null;
 373
 374         # Placeholders for text injection by hooks (must be HTML)
 375         # extensions should take care to _append_ to the present value
 376
 377         /** @var string Before even the preview */
 378         public $editFormPageTop = '';
 379         public $editFormTextTop = '';
 380         public $editFormTextBeforeContent = '';
 381         public $editFormTextAfterWarn = '';
 382         public $editFormTextAfterTools = '';
 383         public $editFormTextBottom = '';
 384         public $editFormTextAfterContent = '';
 385         public $previewTextAfterContent = '';
 386         public $mPreloadContent = null;
 387
 388         /* $didSave should be set to true whenever an article was successfully altered. */
 389         public $didSave = false;
 390         public $undidRev = 0;
 391
 392         public $suppressIntro = false;
 393
 394         /** @var bool */
 395         protected $edit;
 396
 397         /**
 398          * @var bool Set in ApiEditPage, based on ContentHandler::allowsDirectApiEditing
 399          */
 400         private $enableApiEditOverride = false;
 401
 402         /**
 403          * @param Article $article
 404          */
 405         public function __construct( Article $article ) {
 406                 $this->mArticle = $article;
 407                 $this->page = $article->getPage(); // model object
 408                 $this->mTitle = $article->getTitle();
 409
 410                 $this->contentModel = $this->mTitle->getContentModel();
 411
 412                 $handler = ContentHandler::getForModelID( $this->contentModel );
 413                 $this->contentFormat = $handler->getDefaultFormat();
 414         }
 415
 416         /**
 417          * @return Article
 418          */
 419         public function getArticle() {
 420                 return $this->mArticle;
 421         }
 422
 423         /**
 424          * @since 1.19
 425          * @return Title
 426          */
 427         public function getTitle() {
 428                 return $this->mTitle;
 429         }
 430
 431         /**
 432          * Set the context Title object
 433          *
 434          * @param Title|null $title Title object or null
 435          */
 436         public function setContextTitle( $title ) {
 437                 $this->mContextTitle = $title;
 438         }
 439
 440         /**
 441          * Get the context title object.
 442          * If not set, $wgTitle will be returned. This behavior might change in
 443          * the future to return $this->mTitle instead.
 444          *
 445          * @return Title
 446          */
 447         public function getContextTitle() {
 448                 if ( is_null( $this->mContextTitle ) ) {
 449                         global $wgTitle;
 450                         return $wgTitle;
 451                 } else {
 452                         return $this->mContextTitle;
 453                 }
 454         }
 455
 456         /**
 457          * Returns if the given content model is editable.
 458          *
 459          * @param string $modelId The ID of the content model to test. Use CONTENT_MODEL_XXX constants.
 460          * @return bool
 461          * @throws MWException If $modelId has no known handler
 462          */
 463         public function isSupportedContentModel( $modelId ) {
 464                 return $this->enableApiEditOverride === true ||
 465                         ContentHandler::getForModelID( $modelId )->supportsDirectEditing();
 466         }
 467
 468         /**
 469          * Allow editing of content that supports API direct editing, but not general
 470          * direct editing. Set to false by default.
 471          *
 472          * @param bool $enableOverride
 473          */
 474         public function setApiEditOverride( $enableOverride ) {
 475                 $this->enableApiEditOverride = $enableOverride;
 476         }
 477
 478         function submit() {
 479                 $this->edit();
 480         }
 481
 482         /**
 483          * This is the function that gets called for "action=edit". It
 484          * sets up various member variables, then passes execution to
 485          * another function, usually showEditForm()
 486          *
 487          * The edit form is self-submitting, so that when things like
 488          * preview and edit conflicts occur, we get the same form back
 489          * with the extra stuff added.  Only when the final submission
 490          * is made and all is well do we actually save and redirect to
 491          * the newly-edited page.
 492          */
 493         function edit() {
 494                 global $wgOut, $wgRequest, $wgUser;
 495                 // Allow extensions to modify/prevent this form or submission
 496                 if ( !Hooks::run( 'AlternateEdit', [ $this ] ) ) {
 497                         return;
 498                 }
 499
 500                 wfDebug( __METHOD__ . ": enter\n" );
 501
 502                 // If they used redlink=1 and the page exists, redirect to the main article
 503                 if ( $wgRequest->getBool( 'redlink' ) && $this->mTitle->exists() ) {
 504                         $wgOut->redirect( $this->mTitle->getFullURL() );
 505                         return;
 506                 }
 507
 508                 $this->importFormData( $wgRequest );
 509                 $this->firsttime = false;
 510
 511                 if ( wfReadOnly() && $this->save ) {
 512                         // Force preview
 513                         $this->save = false;
 514                         $this->preview = true;
 515                 }
 516
 517                 if ( $this->save ) {
 518                         $this->formtype = 'save';
 519                 } elseif ( $this->preview ) {
 520                         $this->formtype = 'preview';
 521                 } elseif ( $this->diff ) {
 522                         $this->formtype = 'diff';
 523                 } else { # First time through
 524                         $this->firsttime = true;
 525                         if ( $this->previewOnOpen() ) {
 526                                 $this->formtype = 'preview';
 527                         } else {
 528                                 $this->formtype = 'initial';
 529                         }
 530                 }
 531
 532                 $permErrors = $this->getEditPermissionErrors( $this->save ? 'secure' : 'full' );
 533                 if ( $permErrors ) {
 534                         wfDebug( __METHOD__ . ": User can't edit\n" );
 535                         // Auto-block user's IP if the account was "hard" blocked
 536                         if ( !wfReadOnly() ) {
 537                                 $user = $wgUser;
 538                                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
 539                                         $user->spreadAnyEditBlock();
 540                                 } );
 541                         }
 542                         $this->displayPermissionsError( $permErrors );
 543
 544                         return;
 545                 }
 546
 547                 $revision = $this->mArticle->getRevisionFetched();
 548                 // Disallow editing revisions with content models different from the current one
 549                 if ( $revision && $revision->getContentModel() !== $this->contentModel ) {
 550                         $this->displayViewSourcePage(
 551                                 $this->getContentObject(),
 552                                 wfMessage(
 553                                         'contentmodelediterror',
 554                                         $revision->getContentModel(),
 555                                         $this->contentModel
 556                                 )->plain()
 557                         );
 558                         return;
 559                 }
 560
 561                 $this->isConflict = false;
 562                 // css / js subpages of user pages get a special treatment
 563                 $this->isCssJsSubpage = $this->mTitle->isCssJsSubpage();
 564                 $this->isCssSubpage = $this->mTitle->isCssSubpage();
 565                 $this->isJsSubpage = $this->mTitle->isJsSubpage();
 566                 // @todo FIXME: Silly assignment.
 567                 $this->isWrongCaseCssJsPage = $this->isWrongCaseCssJsPage();
 568
 569                 # Show applicable editing introductions
 570                 if ( $this->formtype == 'initial' || $this->firsttime ) {
 571                         $this->showIntro();
 572                 }
 573
 574                 # Attempt submission here.  This will check for edit conflicts,
 575                 # and redundantly check for locked database, blocked IPs, etc.
 576                 # that edit() already checked just in case someone tries to sneak
 577                 # in the back door with a hand-edited submission URL.
 578
 579                 if ( 'save' == $this->formtype ) {
 580                         $resultDetails = null;
 581                         $status = $this->attemptSave( $resultDetails );
 582                         if ( !$this->handleStatus( $status, $resultDetails ) ) {
 583                                 return;
 584                         }
 585                 }
 586
 587                 # First time through: get contents, set time for conflict
 588                 # checking, etc.
 589                 if ( 'initial' == $this->formtype || $this->firsttime ) {
 590                         if ( $this->initialiseForm() === false ) {
 591                                 $this->noSuchSectionPage();
 592                                 return;
 593                         }
 594
 595                         if ( !$this->mTitle->getArticleID() ) {
 596                                 Hooks::run( 'EditFormPreloadText', [ &$this->textbox1, &$this->mTitle ] );
 597                         } else {
 598                                 Hooks::run( 'EditFormInitialText', [ $this ] );
 599                         }
 600
 601                 }
 602
 603                 $this->showEditForm();
 604         }
 605
 606         /**
 607          * @param string $rigor Same format as Title::getUserPermissionErrors()
 608          * @return array
 609          */
 610         protected function getEditPermissionErrors( $rigor = 'secure' ) {
 611                 global $wgUser;
 612
 613                 $permErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser, $rigor );
 614                 # Can this title be created?
 615                 if ( !$this->mTitle->exists() ) {
 616                         $permErrors = array_merge(
 617                                 $permErrors,
 618                                 wfArrayDiff2(
 619                                         $this->mTitle->getUserPermissionsErrors( 'create', $wgUser, $rigor ),
 620                                         $permErrors
 621                                 )
 622                         );
 623                 }
 624                 # Ignore some permissions errors when a user is just previewing/viewing diffs
 625                 $remove = [];
 626                 foreach ( $permErrors as $error ) {
 627                         if ( ( $this->preview || $this->diff )
 628                                 && ( $error[0] == 'blockedtext' || $error[0] == 'autoblockedtext' )
 629                         ) {
 630                                 $remove[] = $error;
 631                         }
 632                 }
 633                 $permErrors = wfArrayDiff2( $permErrors, $remove );
 634
 635                 return $permErrors;
 636         }
 637
 638         /**
 639          * Display a permissions error page, like OutputPage::showPermissionsErrorPage(),
 640          * but with the following differences:
 641          * - If redlink=1, the user will be redirected to the page
 642          * - If there is content to display or the error occurs while either saving,
 643          *   previewing or showing the difference, it will be a
 644          *   "View source for ..." page displaying the source code after the error message.
 645          *
 646          * @since 1.19
 647          * @param array $permErrors Array of permissions errors, as returned by
 648          *    Title::getUserPermissionsErrors().
 649          * @throws PermissionsError
 650          */
 651         protected function displayPermissionsError( array $permErrors ) {
 652                 global $wgRequest, $wgOut;
 653
 654                 if ( $wgRequest->getBool( 'redlink' ) ) {
 655                         // The edit page was reached via a red link.
 656                         // Redirect to the article page and let them click the edit tab if
 657                         // they really want a permission error.
 658                         $wgOut->redirect( $this->mTitle->getFullURL() );
 659                         return;
 660                 }
 661
 662                 $content = $this->getContentObject();
 663
 664                 # Use the normal message if there's nothing to display
 665                 if ( $this->firsttime && ( !$content || $content->isEmpty() ) ) {
 666                         $action = $this->mTitle->exists() ? 'edit' :
 667                                 ( $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage' );
 668                         throw new PermissionsError( $action, $permErrors );
 669                 }
 670
 671                 $this->displayViewSourcePage(
 672                         $content,
 673                         $wgOut->formatPermissionsErrorMessage( $permErrors, 'edit' )
 674                 );
 675         }
 676
 677         /**
 678          * Display a read-only View Source page
 679          * @param Content $content content object
 680          * @param string $errorMessage additional wikitext error message to display
 681          */
 682         protected function displayViewSourcePage( Content $content, $errorMessage = '' ) {
 683                 global $wgOut;
 684
 685                 Hooks::run( 'EditPage::showReadOnlyForm:initial', [ $this, &$wgOut ] );
 686
 687                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 688                 $wgOut->setPageTitle( wfMessage(
 689                         'viewsource-title',
 690                         $this->getContextTitle()->getPrefixedText()
 691                 ) );
 692                 $wgOut->addBacklinkSubtitle( $this->getContextTitle() );
 693                 $wgOut->addHTML( $this->editFormPageTop );
 694                 $wgOut->addHTML( $this->editFormTextTop );
 695
 696                 if ( $errorMessage !== '' ) {
 697                         $wgOut->addWikiText( $errorMessage );
 698                         $wgOut->addHTML( "<hr />\n" );
 699                 }
 700
 701                 # If the user made changes, preserve them when showing the markup
 702                 # (This happens when a user is blocked during edit, for instance)
 703                 if ( !$this->firsttime ) {
 704                         $text = $this->textbox1;
 705                         $wgOut->addWikiMsg( 'viewyourtext' );
 706                 } else {
 707                         try {
 708                                 $text = $this->toEditText( $content );
 709                         } catch ( MWException $e ) {
 710                                 # Serialize using the default format if the content model is not supported
 711                                 # (e.g. for an old revision with a different model)
 712                                 $text = $content->serialize();
 713                         }
 714                         $wgOut->addWikiMsg( 'viewsourcetext' );
 715                 }
 716
 717                 $wgOut->addHTML( $this->editFormTextBeforeContent );
 718                 $this->showTextbox( $text, 'wpTextbox1', [ 'readonly' ] );
 719                 $wgOut->addHTML( $this->editFormTextAfterContent );
 720
 721                 $wgOut->addHTML( Html::rawElement( 'div', [ 'class' => 'templatesUsed' ],
 722                         Linker::formatTemplates( $this->getTemplates() ) ) );
 723
 724                 $wgOut->addModules( 'mediawiki.action.edit.collapsibleFooter' );
 725
 726                 $wgOut->addHTML( $this->editFormTextBottom );
 727                 if ( $this->mTitle->exists() ) {
 728                         $wgOut->returnToMain( null, $this->mTitle );
 729                 }
 730         }
 731
 732         /**
 733          * Should we show a preview when the edit form is first shown?
 734          *
 735          * @return bool
 736          */
 737         protected function previewOnOpen() {
 738                 global $wgRequest, $wgUser, $wgPreviewOnOpenNamespaces;
 739                 if ( $wgRequest->getVal( 'preview' ) == 'yes' ) {
 740                         // Explicit override from request
 741                         return true;
 742                 } elseif ( $wgRequest->getVal( 'preview' ) == 'no' ) {
 743                         // Explicit override from request
 744                         return false;
 745                 } elseif ( $this->section == 'new' ) {
 746                         // Nothing *to* preview for new sections
 747                         return false;
 748                 } elseif ( ( $wgRequest->getVal( 'preload' ) !== null || $this->mTitle->exists() )
 749                         && $wgUser->getOption( 'previewonfirst' )
 750                 ) {
 751                         // Standard preference behavior
 752                         return true;
 753                 } elseif ( !$this->mTitle->exists()
 754                         && isset( $wgPreviewOnOpenNamespaces[$this->mTitle->getNamespace()] )
 755                         && $wgPreviewOnOpenNamespaces[$this->mTitle->getNamespace()]
 756                 ) {
 757                         // Categories are special
 758                         return true;
 759                 } else {
 760                         return false;
 761                 }
 762         }
 763
 764         /**
 765          * Checks whether the user entered a skin name in uppercase,
 766          * e.g. "User:Example/Monobook.css" instead of "monobook.css"
 767          *
 768          * @return bool
 769          */
 770         protected function isWrongCaseCssJsPage() {
 771                 if ( $this->mTitle->isCssJsSubpage() ) {
 772                         $name = $this->mTitle->getSkinFromCssJsSubpage();
 773                         $skins = array_merge(
 774                                 array_keys( Skin::getSkinNames() ),
 775                                 [ 'common' ]
 776                         );
 777                         return !in_array( $name, $skins )
 778                                 && in_array( strtolower( $name ), $skins );
 779                 } else {
 780                         return false;
 781                 }
 782         }
 783
 784         /**
 785          * Returns whether section editing is supported for the current page.
 786          * Subclasses may override this to replace the default behavior, which is
 787          * to check ContentHandler::supportsSections.
 788          *
 789          * @return bool True if this edit page supports sections, false otherwise.
 790          */
 791         protected function isSectionEditSupported() {
 792                 $contentHandler = ContentHandler::getForTitle( $this->mTitle );
 793                 return $contentHandler->supportsSections();
 794         }
 795
 796         /**
 797          * This function collects the form data and uses it to populate various member variables.
 798          * @param WebRequest $request
 799          * @throws ErrorPageError
 800          */
 801         function importFormData( &$request ) {
 802                 global $wgContLang, $wgUser;
 803
 804                 # Section edit can come from either the form or a link
 805                 $this->section = $request->getVal( 'wpSection', $request->getVal( 'section' ) );
 806
 807                 if ( $this->section !== null && $this->section !== '' && !$this->isSectionEditSupported() ) {
 808                         throw new ErrorPageError( 'sectioneditnotsupported-title', 'sectioneditnotsupported-text' );
 809                 }
 810
 811                 $this->isNew = !$this->mTitle->exists() || $this->section == 'new';
 812
 813                 if ( $request->wasPosted() ) {
 814                         # These fields need to be checked for encoding.
 815                         # Also remove trailing whitespace, but don't remove _initial_
 816                         # whitespace from the text boxes. This may be significant formatting.
 817                         $this->textbox1 = $this->safeUnicodeInput( $request, 'wpTextbox1' );
 818                         if ( !$request->getCheck( 'wpTextbox2' ) ) {
 819                                 // Skip this if wpTextbox2 has input, it indicates that we came
 820                                 // from a conflict page with raw page text, not a custom form
 821                                 // modified by subclasses
 822                                 $textbox1 = $this->importContentFormData( $request );
 823                                 if ( $textbox1 !== null ) {
 824                                         $this->textbox1 = $textbox1;
 825                                 }
 826                         }
 827
 828                         # Truncate for whole multibyte characters
 829                         $this->summary = $wgContLang->truncate( $request->getText( 'wpSummary' ), 255 );
 830
 831                         # If the summary consists of a heading, e.g. '==Foobar==', extract the title from the
 832                         # header syntax, e.g. 'Foobar'. This is mainly an issue when we are using wpSummary for
 833                         # section titles.
 834                         $this->summary = preg_replace( '/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->summary );
 835
 836                         # Treat sectiontitle the same way as summary.
 837                         # Note that wpSectionTitle is not yet a part of the actual edit form, as wpSummary is
 838                         # currently doing double duty as both edit summary and section title. Right now this
 839                         # is just to allow API edits to work around this limitation, but this should be
 840                         # incorporated into the actual edit form when EditPage is rewritten (Bugs 18654, 26312).
 841                         $this->sectiontitle = $wgContLang->truncate( $request->getText( 'wpSectionTitle' ), 255 );
 842                         $this->sectiontitle = preg_replace( '/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->sectiontitle );
 843
 844                         $this->edittime = $request->getVal( 'wpEdittime' );
 845                         $this->editRevId = $request->getIntOrNull( 'editRevId' );
 846                         $this->starttime = $request->getVal( 'wpStarttime' );
 847
 848                         $undidRev = $request->getInt( 'wpUndidRevision' );
 849                         if ( $undidRev ) {
 850                                 $this->undidRev = $undidRev;
 851                         }
 852
 853                         $this->scrolltop = $request->getIntOrNull( 'wpScrolltop' );
 854
 855                         if ( $this->textbox1 === '' && $request->getVal( 'wpTextbox1' ) === null ) {
 856                                 // wpTextbox1 field is missing, possibly due to being "too big"
 857                                 // according to some filter rules such as Suhosin's setting for
 858                                 // suhosin.request.max_value_length (d'oh)
 859                                 $this->incompleteForm = true;
 860                         } else {
 861                                 // If we receive the last parameter of the request, we can fairly
 862                                 // claim the POST request has not been truncated.
 863
 864                                 // TODO: softened the check for cutover.  Once we determine
 865                                 // that it is safe, we should complete the transition by
 866                                 // removing the "edittime" clause.
 867                                 $this->incompleteForm = ( !$request->getVal( 'wpUltimateParam' )
 868                                         && is_null( $this->edittime ) );
 869                         }
 870                         if ( $this->incompleteForm ) {
 871                                 # If the form is incomplete, force to preview.
 872                                 wfDebug( __METHOD__ . ": Form data appears to be incomplete\n" );
 873                                 wfDebug( "POST DATA: " . var_export( $_POST, true ) . "\n" );
 874                                 $this->preview = true;
 875                         } else {
 876                                 $this->preview = $request->getCheck( 'wpPreview' );
 877                                 $this->diff = $request->getCheck( 'wpDiff' );
 878
 879                                 // Remember whether a save was requested, so we can indicate
 880                                 // if we forced preview due to session failure.
 881                                 $this->mTriedSave = !$this->preview;
 882
 883                                 if ( $this->tokenOk( $request ) ) {
 884                                         # Some browsers will not report any submit button
 885                                         # if the user hits enter in the comment box.
 886                                         # The unmarked state will be assumed to be a save,
 887                                         # if the form seems otherwise complete.
 888                                         wfDebug( __METHOD__ . ": Passed token check.\n" );
 889                                 } elseif ( $this->diff ) {
 890                                         # Failed token check, but only requested "Show Changes".
 891                                         wfDebug( __METHOD__ . ": Failed token check; Show Changes requested.\n" );
 892                                 } else {
 893                                         # Page might be a hack attempt posted from
 894                                         # an external site. Preview instead of saving.
 895                                         wfDebug( __METHOD__ . ": Failed token check; forcing preview\n" );
 896                                         $this->preview = true;
 897                                 }
 898                         }
 899                         $this->save = !$this->preview && !$this->diff;
 900                         if ( !preg_match( '/^\d{14}$/', $this->edittime ) ) {
 901                                 $this->edittime = null;
 902                         }
 903
 904                         if ( !preg_match( '/^\d{14}$/', $this->starttime ) ) {
 905                                 $this->starttime = null;
 906                         }
 907
 908                         $this->recreate = $request->getCheck( 'wpRecreate' );
 909
 910                         $this->minoredit = $request->getCheck( 'wpMinoredit' );
 911                         $this->watchthis = $request->getCheck( 'wpWatchthis' );
 912
 913                         # Don't force edit summaries when a user is editing their own user or talk page
 914                         if ( ( $this->mTitle->mNamespace == NS_USER || $this->mTitle->mNamespace == NS_USER_TALK )
 915                                 && $this->mTitle->getText() == $wgUser->getName()
 916                         ) {
 917                                 $this->allowBlankSummary = true;
 918                         } else {
 919                                 $this->allowBlankSummary = $request->getBool( 'wpIgnoreBlankSummary' )
 920                                         || !$wgUser->getOption( 'forceeditsummary' );
 921                         }
 922
 923                         $this->autoSumm = $request->getText( 'wpAutoSummary' );
 924
 925                         $this->allowBlankArticle = $request->getBool( 'wpIgnoreBlankArticle' );
 926                         $this->allowSelfRedirect = $request->getBool( 'wpIgnoreSelfRedirect' );
 927
 928                         $changeTags = $request->getVal( 'wpChangeTags' );
 929                         if ( is_null( $changeTags ) || $changeTags === '' ) {
 930                                 $this->changeTags = [];
 931                         } else {
 932                                 $this->changeTags = array_filter( array_map( 'trim', explode( ',',
 933                                         $changeTags ) ) );
 934                         }
 935                 } else {
 936                         # Not a posted form? Start with nothing.
 937                         wfDebug( __METHOD__ . ": Not a posted form.\n" );
 938                         $this->textbox1 = '';
 939                         $this->summary = '';
 940                         $this->sectiontitle = '';
 941                         $this->edittime = '';
 942                         $this->editRevId = null;
 943                         $this->starttime = wfTimestampNow();
 944                         $this->edit = false;
 945                         $this->preview = false;
 946                         $this->save = false;
 947                         $this->diff = false;
 948                         $this->minoredit = false;
 949                         // Watch may be overridden by request parameters
 950                         $this->watchthis = $request->getBool( 'watchthis', false );
 951                         $this->recreate = false;
 952
 953                         // When creating a new section, we can preload a section title by passing it as the
 954                         // preloadtitle parameter in the URL (Bug 13100)
 955                         if ( $this->section == 'new' && $request->getVal( 'preloadtitle' ) ) {
 956                                 $this->sectiontitle = $request->getVal( 'preloadtitle' );
 957                                 // Once wpSummary isn't being use for setting section titles, we should delete this.
 958                                 $this->summary = $request->getVal( 'preloadtitle' );
 959                         } elseif ( $this->section != 'new' && $request->getVal( 'summary' ) ) {
 960                                 $this->summary = $request->getText( 'summary' );
 961                                 if ( $this->summary !== '' ) {
 962                                         $this->hasPresetSummary = true;
 963                                 }
 964                         }
 965
 966                         if ( $request->getVal( 'minor' ) ) {
 967                                 $this->minoredit = true;
 968                         }
 969                 }
 970
 971                 $this->oldid = $request->getInt( 'oldid' );
 972                 $this->parentRevId = $request->getInt( 'parentRevId' );
 973
 974                 $this->bot = $request->getBool( 'bot', true );
 975                 $this->nosummary = $request->getBool( 'nosummary' );
 976
 977                 // May be overridden by revision.
 978                 $this->contentModel = $request->getText( 'model', $this->contentModel );
 979                 // May be overridden by revision.
 980                 $this->contentFormat = $request->getText( 'format', $this->contentFormat );
 981
 982                 if ( !ContentHandler::getForModelID( $this->contentModel )
 983                         ->isSupportedFormat( $this->contentFormat )
 984                 ) {
 985                         throw new ErrorPageError(
 986                                 'editpage-notsupportedcontentformat-title',
 987                                 'editpage-notsupportedcontentformat-text',
 988                                 [ $this->contentFormat, ContentHandler::getLocalizedName( $this->contentModel ) ]
 989                         );
 990                 }
 991
 992                 /**
 993                  * @todo Check if the desired model is allowed in this namespace, and if
 994                  *   a transition from the page's current model to the new model is
 995                  *   allowed.
 996                  */
 997
 998                 $this->editintro = $request->getText( 'editintro',
 999                         // Custom edit intro for new sections
1000                         $this->section === 'new' ? 'MediaWiki:addsection-editintro' : '' );
1001
1002                 // Allow extensions to modify form data
1003                 Hooks::run( 'EditPage::importFormData', [ $this, $request ] );
1004
1005         }
1006
1007         /**
1008          * Subpage overridable method for extracting the page content data from the
1009          * posted form to be placed in $this->textbox1, if using customized input
1010          * this method should be overridden and return the page text that will be used
1011          * for saving, preview parsing and so on...
1012          *
1013          * @param WebRequest $request
1014          * @return string|null
1015          */
1016         protected function importContentFormData( &$request ) {
1017                 return; // Don't do anything, EditPage already extracted wpTextbox1
1018         }
1019
1020         /**
1021          * Initialise form fields in the object
1022          * Called on the first invocation, e.g. when a user clicks an edit link
1023          * @return bool If the requested section is valid
1024          */
1025         function initialiseForm() {
1026                 global $wgUser;
1027                 $this->edittime = $this->page->getTimestamp();
1028                 $this->editRevId = $this->page->getLatest();
1029
1030                 $content = $this->getContentObject( false ); # TODO: track content object?!
1031                 if ( $content === false ) {
1032                         return false;
1033                 }
1034                 $this->textbox1 = $this->toEditText( $content );
1035
1036                 // activate checkboxes if user wants them to be always active
1037                 # Sort out the "watch" checkbox
1038                 if ( $wgUser->getOption( 'watchdefault' ) ) {
1039                         # Watch all edits
1040                         $this->watchthis = true;
1041                 } elseif ( $wgUser->getOption( 'watchcreations' ) && !$this->mTitle->exists() ) {
1042                         # Watch creations
1043                         $this->watchthis = true;
1044                 } elseif ( $wgUser->isWatched( $this->mTitle ) ) {
1045                         # Already watched
1046                         $this->watchthis = true;
1047                 }
1048                 if ( $wgUser->getOption( 'minordefault' ) && !$this->isNew ) {
1049                         $this->minoredit = true;
1050                 }
1051                 if ( $this->textbox1 === false ) {
1052                         return false;
1053                 }
1054                 return true;
1055         }
1056
1057         /**
1058          * @param Content|null $def_content The default value to return
1059          *
1060          * @return Content|null Content on success, $def_content for invalid sections
1061          *
1062          * @since 1.21
1063          */
1064         protected function getContentObject( $def_content = null ) {
1065                 global $wgOut, $wgRequest, $wgUser, $wgContLang;
1066
1067                 $content = false;
1068
1069                 // For message page not locally set, use the i18n message.
1070                 // For other non-existent articles, use preload text if any.
1071                 if ( !$this->mTitle->exists() || $this->section == 'new' ) {
1072                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI && $this->section != 'new' ) {
1073                                 # If this is a system message, get the default text.
1074                                 $msg = $this->mTitle->getDefaultMessageText();
1075
1076                                 $content = $this->toEditContent( $msg );
1077                         }
1078                         if ( $content === false ) {
1079                                 # If requested, preload some text.
1080                                 $preload = $wgRequest->getVal( 'preload',
1081                                         // Custom preload text for new sections
1082                                         $this->section === 'new' ? 'MediaWiki:addsection-preload' : '' );
1083                                 $params = $wgRequest->getArray( 'preloadparams', [] );
1084
1085                                 $content = $this->getPreloadedContent( $preload, $params );
1086                         }
1087                 // For existing pages, get text based on "undo" or section parameters.
1088                 } else {
1089                         if ( $this->section != '' ) {
1090                                 // Get section edit text (returns $def_text for invalid sections)
1091                                 $orig = $this->getOriginalContent( $wgUser );
1092                                 $content = $orig ? $orig->getSection( $this->section ) : null;
1093
1094                                 if ( !$content ) {
1095                                         $content = $def_content;
1096                                 }
1097                         } else {
1098                                 $undoafter = $wgRequest->getInt( 'undoafter' );
1099                                 $undo = $wgRequest->getInt( 'undo' );
1100
1101                                 if ( $undo > 0 && $undoafter > 0 ) {
1102                                         $undorev = Revision::newFromId( $undo );
1103                                         $oldrev = Revision::newFromId( $undoafter );
1104
1105                                         # Sanity check, make sure it's the right page,
1106                                         # the revisions exist and they were not deleted.
1107                                         # Otherwise, $content will be left as-is.
1108                                         if ( !is_null( $undorev ) && !is_null( $oldrev ) &&
1109                                                 !$undorev->isDeleted( Revision::DELETED_TEXT ) &&
1110                                                 !$oldrev->isDeleted( Revision::DELETED_TEXT )
1111                                         ) {
1112                                                 $content = $this->page->getUndoContent( $undorev, $oldrev );
1113
1114                                                 if ( $content === false ) {
1115                                                         # Warn the user that something went wrong
1116                                                         $undoMsg = 'failure';
1117                                                 } else {
1118                                                         $oldContent = $this->page->getContent( Revision::RAW );
1119                                                         $popts = ParserOptions::newFromUserAndLang( $wgUser, $wgContLang );
1120                                                         $newContent = $content->preSaveTransform( $this->mTitle, $wgUser, $popts );
1121
1122                                                         if ( $newContent->equals( $oldContent ) ) {
1123                                                                 # Tell the user that the undo results in no change,
1124                                                                 # i.e. the revisions were already undone.
1125                                                                 $undoMsg = 'nochange';
1126                                                                 $content = false;
1127                                                         } else {
1128                                                                 # Inform the user of our success and set an automatic edit summary
1129                                                                 $undoMsg = 'success';
1130
1131                                                                 # If we just undid one rev, use an autosummary
1132                                                                 $firstrev = $oldrev->getNext();
1133                                                                 if ( $firstrev && $firstrev->getId() == $undo ) {
1134                                                                         $userText = $undorev->getUserText();
1135                                                                         if ( $userText === '' ) {
1136                                                                                 $undoSummary = wfMessage(
1137                                                                                         'undo-summary-username-hidden',
1138                                                                                         $undo
1139                                                                                 )->inContentLanguage()->text();
1140                                                                         } else {
1141                                                                                 $undoSummary = wfMessage(
1142                                                                                         'undo-summary',
1143                                                                                         $undo,
1144                                                                                         $userText
1145                                                                                 )->inContentLanguage()->text();
1146                                                                         }
1147                                                                         if ( $this->summary === '' ) {
1148                                                                                 $this->summary = $undoSummary;
1149                                                                         } else {
1150                                                                                 $this->summary = $undoSummary . wfMessage( 'colon-separator' )
1151                                                                                         ->inContentLanguage()->text() . $this->summary;
1152                                                                         }
1153                                                                         $this->undidRev = $undo;
1154                                                                 }
1155                                                                 $this->formtype = 'diff';
1156                                                         }
1157                                                 }
1158                                         } else {
1159                                                 // Failed basic sanity checks.
1160                                                 // Older revisions may have been removed since the link
1161                                                 // was created, or we may simply have got bogus input.
1162                                                 $undoMsg = 'norev';
1163                                         }
1164
1165                                         // Messages: undo-success, undo-failure, undo-norev, undo-nochange
1166                                         $class = ( $undoMsg == 'success' ? '' : 'error ' ) . "mw-undo-{$undoMsg}";
1167                                         $this->editFormPageTop .= $wgOut->parse( "<div class=\"{$class}\">" .
1168                                                 wfMessage( 'undo-' . $undoMsg )->plain() . '</div>', true, /* interface */true );
1169                                 }
1170
1171                                 if ( $content === false ) {
1172                                         $content = $this->getOriginalContent( $wgUser );
1173                                 }
1174                         }
1175                 }
1176
1177                 return $content;
1178         }
1179
1180         /**
1181          * Get the content of the wanted revision, without section extraction.
1182          *
1183          * The result of this function can be used to compare user's input with
1184          * section replaced in its context (using WikiPage::replaceSectionAtRev())
1185          * to the original text of the edit.
1186          *
1187          * This differs from Article::getContent() that when a missing revision is
1188          * encountered the result will be null and not the
1189          * 'missing-revision' message.
1190          *
1191          * @since 1.19
1192          * @param User $user The user to get the revision for
1193          * @return Content|null
1194          */
1195         private function getOriginalContent( User $user ) {
1196                 if ( $this->section == 'new' ) {
1197                         return $this->getCurrentContent();
1198                 }
1199                 $revision = $this->mArticle->getRevisionFetched();
1200                 if ( $revision === null ) {
1201                         if ( !$this->contentModel ) {
1202                                 $this->contentModel = $this->getTitle()->getContentModel();
1203                         }
1204                         $handler = ContentHandler::getForModelID( $this->contentModel );
1205
1206                         return $handler->makeEmptyContent();
1207                 }
1208                 $content = $revision->getContent( Revision::FOR_THIS_USER, $user );
1209                 return $content;
1210         }
1211
1212         /**
1213          * Get the edit's parent revision ID
1214          *
1215          * The "parent" revision is the ancestor that should be recorded in this
1216          * page's revision history.  It is either the revision ID of the in-memory
1217          * article content, or in the case of a 3-way merge in order to rebase
1218          * across a recoverable edit conflict, the ID of the newer revision to
1219          * which we have rebased this page.
1220          *
1221          * @since 1.27
1222          * @return int Revision ID
1223          */
1224         public function getParentRevId() {
1225                 if ( $this->parentRevId ) {
1226                         return $this->parentRevId;
1227                 } else {
1228                         return $this->mArticle->getRevIdFetched();
1229                 }
1230         }
1231
1232         /**
1233          * Get the current content of the page. This is basically similar to
1234          * WikiPage::getContent( Revision::RAW ) except that when the page doesn't exist an empty
1235          * content object is returned instead of null.
1236          *
1237          * @since 1.21
1238          * @return Content
1239          */
1240         protected function getCurrentContent() {
1241                 $rev = $this->page->getRevision();
1242                 $content = $rev ? $rev->getContent( Revision::RAW ) : null;
1243
1244                 if ( $content === false || $content === null ) {
1245                         if ( !$this->contentModel ) {
1246                                 $this->contentModel = $this->getTitle()->getContentModel();
1247                         }
1248                         $handler = ContentHandler::getForModelID( $this->contentModel );
1249
1250                         return $handler->makeEmptyContent();
1251                 } else {
1252                         # nasty side-effect, but needed for consistency
1253                         $this->contentModel = $rev->getContentModel();
1254                         $this->contentFormat = $rev->getContentFormat();
1255
1256                         return $content;
1257                 }
1258         }
1259
1260         /**
1261          * Use this method before edit() to preload some content into the edit box
1262          *
1263          * @param Content $content
1264          *
1265          * @since 1.21
1266          */
1267         public function setPreloadedContent( Content $content ) {
1268                 $this->mPreloadContent = $content;
1269         }
1270
1271         /**
1272          * Get the contents to be preloaded into the box, either set by
1273          * an earlier setPreloadText() or by loading the given page.
1274          *
1275          * @param string $preload Representing the title to preload from.
1276          * @param array $params Parameters to use (interface-message style) in the preloaded text
1277          *
1278          * @return Content
1279          *
1280          * @since 1.21
1281          */
1282         protected function getPreloadedContent( $preload, $params = [] ) {
1283                 global $wgUser;
1284
1285                 if ( !empty( $this->mPreloadContent ) ) {
1286                         return $this->mPreloadContent;
1287                 }
1288
1289                 $handler = ContentHandler::getForTitle( $this->getTitle() );
1290
1291                 if ( $preload === '' ) {
1292                         return $handler->makeEmptyContent();
1293                 }
1294
1295                 $title = Title::newFromText( $preload );
1296                 # Check for existence to avoid getting MediaWiki:Noarticletext
1297                 if ( $title === null || !$title->exists() || !$title->userCan( 'read', $wgUser ) ) {
1298                         // TODO: somehow show a warning to the user!
1299                         return $handler->makeEmptyContent();
1300                 }
1301
1302                 $page = WikiPage::factory( $title );
1303                 if ( $page->isRedirect() ) {
1304                         $title = $page->getRedirectTarget();
1305                         # Same as before
1306                         if ( $title === null || !$title->exists() || !$title->userCan( 'read', $wgUser ) ) {
1307                                 // TODO: somehow show a warning to the user!
1308                                 return $handler->makeEmptyContent();
1309                         }
1310                         $page = WikiPage::factory( $title );
1311                 }
1312
1313                 $parserOptions = ParserOptions::newFromUser( $wgUser );
1314                 $content = $page->getContent( Revision::RAW );
1315
1316                 if ( !$content ) {
1317                         // TODO: somehow show a warning to the user!
1318                         return $handler->makeEmptyContent();
1319                 }
1320
1321                 if ( $content->getModel() !== $handler->getModelID() ) {
1322                         $converted = $content->convert( $handler->getModelID() );
1323
1324                         if ( !$converted ) {
1325                                 // TODO: somehow show a warning to the user!
1326                                 wfDebug( "Attempt to preload incompatible content: " .
1327                                         "can't convert " . $content->getModel() .
1328                                         " to " . $handler->getModelID() );
1329
1330                                 return $handler->makeEmptyContent();
1331                         }
1332
1333                         $content = $converted;
1334                 }
1335
1336                 return $content->preloadTransform( $title, $parserOptions, $params );
1337         }
1338
1339         /**
1340          * Make sure the form isn't faking a user's credentials.
1341          *
1342          * @param WebRequest $request
1343          * @return bool
1344          * @private
1345          */
1346         function tokenOk( &$request ) {
1347                 global $wgUser;
1348                 $token = $request->getVal( 'wpEditToken' );
1349                 $this->mTokenOk = $wgUser->matchEditToken( $token );
1350                 $this->mTokenOkExceptSuffix = $wgUser->matchEditTokenNoSuffix( $token );
1351                 return $this->mTokenOk;
1352         }
1353
1354         /**
1355          * Sets post-edit cookie indicating the user just saved a particular revision.
1356          *
1357          * This uses a temporary cookie for each revision ID so separate saves will never
1358          * interfere with each other.
1359          *
1360          * The cookie is deleted in the mediawiki.action.view.postEdit JS module after
1361          * the redirect.  It must be clearable by JavaScript code, so it must not be
1362          * marked HttpOnly. The JavaScript code converts the cookie to a wgPostEdit config
1363          * variable.
1364          *
1365          * If the variable were set on the server, it would be cached, which is unwanted
1366          * since the post-edit state should only apply to the load right after the save.
1367          *
1368          * @param int $statusValue The status value (to check for new article status)
1369          */
1370         protected function setPostEditCookie( $statusValue ) {
1371                 $revisionId = $this->page->getLatest();
1372                 $postEditKey = self::POST_EDIT_COOKIE_KEY_PREFIX . $revisionId;
1373
1374                 $val = 'saved';
1375                 if ( $statusValue == self::AS_SUCCESS_NEW_ARTICLE ) {
1376                         $val = 'created';
1377                 } elseif ( $this->oldid ) {
1378                         $val = 'restored';
1379                 }
1380
1381                 $response = RequestContext::getMain()->getRequest()->response();
1382                 $response->setCookie( $postEditKey, $val, time() + self::POST_EDIT_COOKIE_DURATION, [
1383                         'httpOnly' => false,
1384                 ] );
1385         }
1386
1387         /**
1388          * Attempt submission
1389          * @param array $resultDetails See docs for $result in internalAttemptSave
1390          * @throws UserBlockedError|ReadOnlyError|ThrottledError|PermissionsError
1391          * @return Status The resulting status object.
1392          */
1393         public function attemptSave( &$resultDetails = false ) {
1394                 global $wgUser;
1395
1396                 # Allow bots to exempt some edits from bot flagging
1397                 $bot = $wgUser->isAllowed( 'bot' ) && $this->bot;
1398                 $status = $this->internalAttemptSave( $resultDetails, $bot );
1399
1400                 Hooks::run( 'EditPage::attemptSave:after', [ $this, $status, $resultDetails ] );
1401
1402                 return $status;
1403         }
1404
1405         /**
1406          * Handle status, such as after attempt save
1407          *
1408          * @param Status $status
1409          * @param array|bool $resultDetails
1410          *
1411          * @throws ErrorPageError
1412          * @return bool False, if output is done, true if rest of the form should be displayed
1413          */
1414         private function handleStatus( Status $status, $resultDetails ) {
1415                 global $wgUser, $wgOut;
1416
1417                 /**
1418                  * @todo FIXME: once the interface for internalAttemptSave() is made
1419                  *   nicer, this should use the message in $status
1420                  */
1421                 if ( $status->value == self::AS_SUCCESS_UPDATE
1422                         || $status->value == self::AS_SUCCESS_NEW_ARTICLE
1423                 ) {
1424                         $this->didSave = true;
1425                         if ( !$resultDetails['nullEdit'] ) {
1426                                 $this->setPostEditCookie( $status->value );
1427                         }
1428                 }
1429
1430                 // "wpExtraQueryRedirect" is a hidden input to modify
1431                 // after save URL and is not used by actual edit form
1432                 $request = RequestContext::getMain()->getRequest();
1433                 $extraQueryRedirect = $request->getVal( 'wpExtraQueryRedirect' );
1434
1435                 switch ( $status->value ) {
1436                         case self::AS_HOOK_ERROR_EXPECTED:
1437                         case self::AS_CONTENT_TOO_BIG:
1438                         case self::AS_ARTICLE_WAS_DELETED:
1439                         case self::AS_CONFLICT_DETECTED:
1440                         case self::AS_SUMMARY_NEEDED:
1441                         case self::AS_TEXTBOX_EMPTY:
1442                         case self::AS_MAX_ARTICLE_SIZE_EXCEEDED:
1443                         case self::AS_END:
1444                         case self::AS_BLANK_ARTICLE:
1445                         case self::AS_SELF_REDIRECT:
1446                                 return true;
1447
1448                         case self::AS_HOOK_ERROR:
1449                                 return false;
1450
1451                         case self::AS_CANNOT_USE_CUSTOM_MODEL:
1452                         case self::AS_PARSE_ERROR:
1453                                 $wgOut->addWikiText( '<div class="error">' . $status->getWikiText() . '</div>' );
1454                                 return true;
1455
1456                         case self::AS_SUCCESS_NEW_ARTICLE:
1457                                 $query = $resultDetails['redirect'] ? 'redirect=no' : '';
1458                                 if ( $extraQueryRedirect ) {
1459                                         if ( $query === '' ) {
1460                                                 $query = $extraQueryRedirect;
1461                                         } else {
1462                                                 $query = $query . '&' . $extraQueryRedirect;
1463                                         }
1464                                 }
1465                                 $anchor = isset( $resultDetails['sectionanchor'] ) ? $resultDetails['sectionanchor'] : '';
1466                                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $anchor );
1467                                 return false;
1468
1469                         case self::AS_SUCCESS_UPDATE:
1470                                 $extraQuery = '';
1471                                 $sectionanchor = $resultDetails['sectionanchor'];
1472
1473                                 // Give extensions a chance to modify URL query on update
1474                                 Hooks::run(
1475                                         'ArticleUpdateBeforeRedirect',
1476                                         [ $this->mArticle, &$sectionanchor, &$extraQuery ]
1477                                 );
1478
1479                                 if ( $resultDetails['redirect'] ) {
1480                                         if ( $extraQuery == '' ) {
1481                                                 $extraQuery = 'redirect=no';
1482                                         } else {
1483                                                 $extraQuery = 'redirect=no&' . $extraQuery;
1484                                         }
1485                                 }
1486                                 if ( $extraQueryRedirect ) {
1487                                         if ( $extraQuery === '' ) {
1488                                                 $extraQuery = $extraQueryRedirect;
1489                                         } else {
1490                                                 $extraQuery = $extraQuery . '&' . $extraQueryRedirect;
1491                                         }
1492                                 }
1493
1494                                 $wgOut->redirect( $this->mTitle->getFullURL( $extraQuery ) . $sectionanchor );
1495                                 return false;
1496
1497                         case self::AS_SPAM_ERROR:
1498                                 $this->spamPageWithContent( $resultDetails['spam'] );
1499                                 return false;
1500
1501                         case self::AS_BLOCKED_PAGE_FOR_USER:
1502                                 throw new UserBlockedError( $wgUser->getBlock() );
1503
1504                         case self::AS_IMAGE_REDIRECT_ANON:
1505                         case self::AS_IMAGE_REDIRECT_LOGGED:
1506                                 throw new PermissionsError( 'upload' );
1507
1508                         case self::AS_READ_ONLY_PAGE_ANON:
1509                         case self::AS_READ_ONLY_PAGE_LOGGED:
1510                                 throw new PermissionsError( 'edit' );
1511
1512                         case self::AS_READ_ONLY_PAGE:
1513                                 throw new ReadOnlyError;
1514
1515                         case self::AS_RATE_LIMITED:
1516                                 throw new ThrottledError();
1517
1518                         case self::AS_NO_CREATE_PERMISSION:
1519                                 $permission = $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage';
1520                                 throw new PermissionsError( $permission );
1521
1522                         case self::AS_NO_CHANGE_CONTENT_MODEL:
1523                                 throw new PermissionsError( 'editcontentmodel' );
1524
1525                         default:
1526                                 // We don't recognize $status->value. The only way that can happen
1527                                 // is if an extension hook aborted from inside ArticleSave.
1528                                 // Render the status object into $this->hookError
1529                                 // FIXME this sucks, we should just use the Status object throughout
1530                                 $this->hookError = '<div class="error">' . $status->getWikiText() .
1531                                         '</div>';
1532                                 return true;
1533                 }
1534         }
1535
1536         /**
1537          * Run hooks that can filter edits just before they get saved.
1538          *
1539          * @param Content $content The Content to filter.
1540          * @param Status $status For reporting the outcome to the caller
1541          * @param User $user The user performing the edit
1542          *
1543          * @return bool
1544          */
1545         protected function runPostMergeFilters( Content $content, Status $status, User $user ) {
1546                 // Run old style post-section-merge edit filter
1547                 if ( !ContentHandler::runLegacyHooks( 'EditFilterMerged',
1548                         [ $this, $content, &$this->hookError, $this->summary ] )
1549                 ) {
1550                         # Error messages etc. could be handled within the hook...
1551                         $status->fatal( 'hookaborted' );
1552                         $status->value = self::AS_HOOK_ERROR;
1553                         return false;
1554                 } elseif ( $this->hookError != '' ) {
1555                         # ...or the hook could be expecting us to produce an error
1556                         $status->fatal( 'hookaborted' );
1557                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1558                         return false;
1559                 }
1560
1561                 // Run new style post-section-merge edit filter
1562                 if ( !Hooks::run( 'EditFilterMergedContent',
1563                                 [ $this->mArticle->getContext(), $content, $status, $this->summary,
1564                                 $user, $this->minoredit ] )
1565                 ) {
1566                         # Error messages etc. could be handled within the hook...
1567                         if ( $status->isGood() ) {
1568                                 $status->fatal( 'hookaborted' );
1569                                 // Not setting $this->hookError here is a hack to allow the hook
1570                                 // to cause a return to the edit page without $this->hookError
1571                                 // being set. This is used by ConfirmEdit to display a captcha
1572                                 // without any error message cruft.
1573                         } else {
1574                                 $this->hookError = $status->getWikiText();
1575                         }
1576                         // Use the existing $status->value if the hook set it
1577                         if ( !$status->value ) {
1578                                 $status->value = self::AS_HOOK_ERROR;
1579                         }
1580                         return false;
1581                 } elseif ( !$status->isOK() ) {
1582                         # ...or the hook could be expecting us to produce an error
1583                         // FIXME this sucks, we should just use the Status object throughout
1584                         $this->hookError = $status->getWikiText();
1585                         $status->fatal( 'hookaborted' );
1586                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1587                         return false;
1588                 }
1589
1590                 return true;
1591         }
1592
1593         /**
1594          * Return the summary to be used for a new section.
1595          *
1596          * @param string $sectionanchor Set to the section anchor text
1597          * @return string
1598          */
1599         private function newSectionSummary( &$sectionanchor = null ) {
1600                 global $wgParser;
1601
1602                 if ( $this->sectiontitle !== '' ) {
1603                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $this->sectiontitle );
1604                         // If no edit summary was specified, create one automatically from the section
1605                         // title and have it link to the new section. Otherwise, respect the summary as
1606                         // passed.
1607                         if ( $this->summary === '' ) {
1608                                 $cleanSectionTitle = $wgParser->stripSectionName( $this->sectiontitle );
1609                                 return wfMessage( 'newsectionsummary' )
1610                                         ->rawParams( $cleanSectionTitle )->inContentLanguage()->text();
1611                         }
1612                 } elseif ( $this->summary !== '' ) {
1613                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $this->summary );
1614                         # This is a new section, so create a link to the new section
1615                         # in the revision summary.
1616                         $cleanSummary = $wgParser->stripSectionName( $this->summary );
1617                         return wfMessage( 'newsectionsummary' )
1618                                 ->rawParams( $cleanSummary )->inContentLanguage()->text();
1619                 }
1620                 return $this->summary;
1621         }
1622
1623         /**
1624          * Attempt submission (no UI)
1625          *
1626          * @param array $result Array to add statuses to, currently with the
1627          *   possible keys:
1628          *   - spam (string): Spam string from content if any spam is detected by
1629          *     matchSpamRegex.
1630          *   - sectionanchor (string): Section anchor for a section save.
1631          *   - nullEdit (boolean): Set if doEditContent is OK.  True if null edit,
1632          *     false otherwise.
1633          *   - redirect (bool): Set if doEditContent is OK. True if resulting
1634          *     revision is a redirect.
1635          * @param bool $bot True if edit is being made under the bot right.
1636          *
1637          * @return Status Status object, possibly with a message, but always with
1638          *   one of the AS_* constants in $status->value,
1639          *
1640          * @todo FIXME: This interface is TERRIBLE, but hard to get rid of due to
1641          *   various error display idiosyncrasies. There are also lots of cases
1642          *   where error metadata is set in the object and retrieved later instead
1643          *   of being returned, e.g. AS_CONTENT_TOO_BIG and
1644          *   AS_BLOCKED_PAGE_FOR_USER. All that stuff needs to be cleaned up some
1645          * time.
1646          */
1647         function internalAttemptSave( &$result, $bot = false ) {
1648                 global $wgUser, $wgRequest, $wgParser, $wgMaxArticleSize;
1649                 global $wgContentHandlerUseDB;
1650
1651                 $status = Status::newGood();
1652
1653                 if ( !Hooks::run( 'EditPage::attemptSave', [ $this ] ) ) {
1654                         wfDebug( "Hook 'EditPage::attemptSave' aborted article saving\n" );
1655                         $status->fatal( 'hookaborted' );
1656                         $status->value = self::AS_HOOK_ERROR;
1657                         return $status;
1658                 }
1659
1660                 $spam = $wgRequest->getText( 'wpAntispam' );
1661                 if ( $spam !== '' ) {
1662                         wfDebugLog(
1663                                 'SimpleAntiSpam',
1664                                 $wgUser->getName() .
1665                                 ' editing "' .
1666                                 $this->mTitle->getPrefixedText() .
1667                                 '" submitted bogus field "' .
1668                                 $spam .
1669                                 '"'
1670                         );
1671                         $status->fatal( 'spamprotectionmatch', false );
1672                         $status->value = self::AS_SPAM_ERROR;
1673                         return $status;
1674                 }
1675
1676                 try {
1677                         # Construct Content object
1678                         $textbox_content = $this->toEditContent( $this->textbox1 );
1679                 } catch ( MWContentSerializationException $ex ) {
1680                         $status->fatal(
1681                                 'content-failed-to-parse',
1682                                 $this->contentModel,
1683                                 $this->contentFormat,
1684                                 $ex->getMessage()
1685                         );
1686                         $status->value = self::AS_PARSE_ERROR;
1687                         return $status;
1688                 }
1689
1690                 # Check image redirect
1691                 if ( $this->mTitle->getNamespace() == NS_FILE &&
1692                         $textbox_content->isRedirect() &&
1693                         !$wgUser->isAllowed( 'upload' )
1694                 ) {
1695                                 $code = $wgUser->isAnon() ? self::AS_IMAGE_REDIRECT_ANON : self::AS_IMAGE_REDIRECT_LOGGED;
1696                                 $status->setResult( false, $code );
1697
1698                                 return $status;
1699                 }
1700
1701                 # Check for spam
1702                 $match = self::matchSummarySpamRegex( $this->summary );
1703                 if ( $match === false && $this->section == 'new' ) {
1704                         # $wgSpamRegex is enforced on this new heading/summary because, unlike
1705                         # regular summaries, it is added to the actual wikitext.
1706                         if ( $this->sectiontitle !== '' ) {
1707                                 # This branch is taken when the API is used with the 'sectiontitle' parameter.
1708                                 $match = self::matchSpamRegex( $this->sectiontitle );
1709                         } else {
1710                                 # This branch is taken when the "Add Topic" user interface is used, or the API
1711                                 # is used with the 'summary' parameter.
1712                                 $match = self::matchSpamRegex( $this->summary );
1713                         }
1714                 }
1715                 if ( $match === false ) {
1716                         $match = self::matchSpamRegex( $this->textbox1 );
1717                 }
1718                 if ( $match !== false ) {
1719                         $result['spam'] = $match;
1720                         $ip = $wgRequest->getIP();
1721                         $pdbk = $this->mTitle->getPrefixedDBkey();
1722                         $match = str_replace( "\n", '', $match );
1723                         wfDebugLog( 'SpamRegex', "$ip spam regex hit [[$pdbk]]: \"$match\"" );
1724                         $status->fatal( 'spamprotectionmatch', $match );
1725                         $status->value = self::AS_SPAM_ERROR;
1726                         return $status;
1727                 }
1728                 if ( !Hooks::run(
1729                         'EditFilter',
1730                         [ $this, $this->textbox1, $this->section, &$this->hookError, $this->summary ] )
1731                 ) {
1732                         # Error messages etc. could be handled within the hook...
1733                         $status->fatal( 'hookaborted' );
1734                         $status->value = self::AS_HOOK_ERROR;
1735                         return $status;
1736                 } elseif ( $this->hookError != '' ) {
1737                         # ...or the hook could be expecting us to produce an error
1738                         $status->fatal( 'hookaborted' );
1739                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1740                         return $status;
1741                 }
1742
1743                 if ( $wgUser->isBlockedFrom( $this->mTitle, false ) ) {
1744                         // Auto-block user's IP if the account was "hard" blocked
1745                         if ( !wfReadOnly() ) {
1746                                 $wgUser->spreadAnyEditBlock();
1747                         }
1748                         # Check block state against master, thus 'false'.
1749                         $status->setResult( false, self::AS_BLOCKED_PAGE_FOR_USER );
1750                         return $status;
1751                 }
1752
1753                 $this->kblength = (int)( strlen( $this->textbox1 ) / 1024 );
1754                 if ( $this->kblength > $wgMaxArticleSize ) {
1755                         // Error will be displayed by showEditForm()
1756                         $this->tooBig = true;
1757                         $status->setResult( false, self::AS_CONTENT_TOO_BIG );
1758                         return $status;
1759                 }
1760
1761                 if ( !$wgUser->isAllowed( 'edit' ) ) {
1762                         if ( $wgUser->isAnon() ) {
1763                                 $status->setResult( false, self::AS_READ_ONLY_PAGE_ANON );
1764                                 return $status;
1765                         } else {
1766                                 $status->fatal( 'readonlytext' );
1767                                 $status->value = self::AS_READ_ONLY_PAGE_LOGGED;
1768                                 return $status;
1769                         }
1770                 }
1771
1772                 $changingContentModel = false;
1773                 if ( $this->contentModel !== $this->mTitle->getContentModel() ) {
1774                         if ( !$wgContentHandlerUseDB ) {
1775                                 $status->fatal( 'editpage-cannot-use-custom-model' );
1776                                 $status->value = self::AS_CANNOT_USE_CUSTOM_MODEL;
1777                                 return $status;
1778                         } elseif ( !$wgUser->isAllowed( 'editcontentmodel' ) ) {
1779                                 $status->setResult( false, self::AS_NO_CHANGE_CONTENT_MODEL );
1780                                 return $status;
1781
1782                         }
1783                         $changingContentModel = true;
1784                         $oldContentModel = $this->mTitle->getContentModel();
1785                 }
1786
1787                 if ( $this->changeTags ) {
1788                         $changeTagsStatus = ChangeTags::canAddTagsAccompanyingChange(
1789                                 $this->changeTags, $wgUser );
1790                         if ( !$changeTagsStatus->isOK() ) {
1791                                 $changeTagsStatus->value = self::AS_CHANGE_TAG_ERROR;
1792                                 return $changeTagsStatus;
1793                         }
1794                 }
1795
1796                 if ( wfReadOnly() ) {
1797                         $status->fatal( 'readonlytext' );
1798                         $status->value = self::AS_READ_ONLY_PAGE;
1799                         return $status;
1800                 }
1801                 if ( $wgUser->pingLimiter() || $wgUser->pingLimiter( 'linkpurge', 0 ) ) {
1802                         $status->fatal( 'actionthrottledtext' );
1803                         $status->value = self::AS_RATE_LIMITED;
1804                         return $status;
1805                 }
1806
1807                 # If the article has been deleted while editing, don't save it without
1808                 # confirmation
1809                 if ( $this->wasDeletedSinceLastEdit() && !$this->recreate ) {
1810                         $status->setResult( false, self::AS_ARTICLE_WAS_DELETED );
1811                         return $status;
1812                 }
1813
1814                 # Load the page data from the master. If anything changes in the meantime,
1815                 # we detect it by using page_latest like a token in a 1 try compare-and-swap.
1816                 $this->page->loadPageData( 'fromdbmaster' );
1817                 $new = !$this->page->exists();
1818
1819                 if ( $new ) {
1820                         // Late check for create permission, just in case *PARANOIA*
1821                         if ( !$this->mTitle->userCan( 'create', $wgUser ) ) {
1822                                 $status->fatal( 'nocreatetext' );
1823                                 $status->value = self::AS_NO_CREATE_PERMISSION;
1824                                 wfDebug( __METHOD__ . ": no create permission\n" );
1825                                 return $status;
1826                         }
1827
1828                         // Don't save a new page if it's blank or if it's a MediaWiki:
1829                         // message with content equivalent to default (allow empty pages
1830                         // in this case to disable messages, see bug 50124)
1831                         $defaultMessageText = $this->mTitle->getDefaultMessageText();
1832                         if ( $this->mTitle->getNamespace() === NS_MEDIAWIKI && $defaultMessageText !== false ) {
1833                                 $defaultText = $defaultMessageText;
1834                         } else {
1835                                 $defaultText = '';
1836                         }
1837
1838                         if ( !$this->allowBlankArticle && $this->textbox1 === $defaultText ) {
1839                                 $this->blankArticle = true;
1840                                 $status->fatal( 'blankarticle' );
1841                                 $status->setResult( false, self::AS_BLANK_ARTICLE );
1842                                 return $status;
1843                         }
1844
1845                         if ( !$this->runPostMergeFilters( $textbox_content, $status, $wgUser ) ) {
1846                                 return $status;
1847                         }
1848
1849                         $content = $textbox_content;
1850
1851                         $result['sectionanchor'] = '';
1852                         if ( $this->section == 'new' ) {
1853                                 if ( $this->sectiontitle !== '' ) {
1854                                         // Insert the section title above the content.
1855                                         $content = $content->addSectionHeader( $this->sectiontitle );
1856                                 } elseif ( $this->summary !== '' ) {
1857                                         // Insert the section title above the content.
1858                                         $content = $content->addSectionHeader( $this->summary );
1859                                 }
1860                                 $this->summary = $this->newSectionSummary( $result['sectionanchor'] );
1861                         }
1862
1863                         $status->value = self::AS_SUCCESS_NEW_ARTICLE;
1864
1865                 } else { # not $new
1866
1867                         # Article exists. Check for edit conflict.
1868
1869                         $this->page->clear(); # Force reload of dates, etc.
1870                         $timestamp = $this->page->getTimestamp();
1871                         $latest = $this->page->getLatest();
1872
1873                         wfDebug( "timestamp: {$timestamp}, edittime: {$this->edittime}\n" );
1874
1875                         // Check editRevId if set, which handles same-second timestamp collisions
1876                         if ( $timestamp != $this->edittime
1877                                 || ( $this->editRevId !== null && $this->editRevId != $latest )
1878                         ) {
1879                                 $this->isConflict = true;
1880                                 if ( $this->section == 'new' ) {
1881                                         if ( $this->page->getUserText() == $wgUser->getName() &&
1882                                                 $this->page->getComment() == $this->newSectionSummary()
1883                                         ) {
1884                                                 // Probably a duplicate submission of a new comment.
1885                                                 // This can happen when CDN resends a request after
1886                                                 // a timeout but the first one actually went through.
1887                                                 wfDebug( __METHOD__
1888                                                         . ": duplicate new section submission; trigger edit conflict!\n" );
1889                                         } else {
1890                                                 // New comment; suppress conflict.
1891                                                 $this->isConflict = false;
1892                                                 wfDebug( __METHOD__ . ": conflict suppressed; new section\n" );
1893                                         }
1894                                 } elseif ( $this->section == ''
1895                                         && Revision::userWasLastToEdit(
1896                                                 DB_MASTER, $this->mTitle->getArticleID(),
1897                                                 $wgUser->getId(), $this->edittime
1898                                         )
1899                                 ) {
1900                                         # Suppress edit conflict with self, except for section edits where merging is required.
1901                                         wfDebug( __METHOD__ . ": Suppressing edit conflict, same user.\n" );
1902                                         $this->isConflict = false;
1903                                 }
1904                         }
1905
1906                         // If sectiontitle is set, use it, otherwise use the summary as the section title.
1907                         if ( $this->sectiontitle !== '' ) {
1908                                 $sectionTitle = $this->sectiontitle;
1909                         } else {
1910                                 $sectionTitle = $this->summary;
1911                         }
1912
1913                         $content = null;
1914
1915                         if ( $this->isConflict ) {
1916                                 wfDebug( __METHOD__
1917                                         . ": conflict! getting section '{$this->section}' for time '{$this->edittime}'"
1918                                         . " (id '{$this->editRevId}') (article time '{$timestamp}')\n" );
1919                                 // @TODO: replaceSectionAtRev() with base ID (not prior current) for ?oldid=X case
1920                                 // ...or disable section editing for non-current revisions (not exposed anyway).
1921                                 if ( $this->editRevId !== null ) {
1922                                         $content = $this->page->replaceSectionAtRev(
1923                                                 $this->section,
1924                                                 $textbox_content,
1925                                                 $sectionTitle,
1926                                                 $this->editRevId
1927                                         );
1928                                 } else {
1929                                         $content = $this->page->replaceSectionContent(
1930                                                 $this->section,
1931                                                 $textbox_content,
1932                                                 $sectionTitle,
1933                                                 $this->edittime
1934                                         );
1935                                 }
1936                         } else {
1937                                 wfDebug( __METHOD__ . ": getting section '{$this->section}'\n" );
1938                                 $content = $this->page->replaceSectionContent(
1939                                         $this->section,
1940                                         $textbox_content,
1941                                         $sectionTitle
1942                                 );
1943                         }
1944
1945                         if ( is_null( $content ) ) {
1946                                 wfDebug( __METHOD__ . ": activating conflict; section replace failed.\n" );
1947                                 $this->isConflict = true;
1948                                 $content = $textbox_content; // do not try to merge here!
1949                         } elseif ( $this->isConflict ) {
1950                                 # Attempt merge
1951                                 if ( $this->mergeChangesIntoContent( $content ) ) {
1952                                         // Successful merge! Maybe we should tell the user the good news?
1953                                         $this->isConflict = false;
1954                                         wfDebug( __METHOD__ . ": Suppressing edit conflict, successful merge.\n" );
1955                                 } else {
1956                                         $this->section = '';
1957                                         $this->textbox1 = ContentHandler::getContentText( $content );
1958                                         wfDebug( __METHOD__ . ": Keeping edit conflict, failed merge.\n" );
1959                                 }
1960                         }
1961
1962                         if ( $this->isConflict ) {
1963                                 $status->setResult( false, self::AS_CONFLICT_DETECTED );
1964                                 return $status;
1965                         }
1966
1967                         if ( !$this->runPostMergeFilters( $content, $status, $wgUser ) ) {
1968                                 return $status;
1969                         }
1970
1971                         if ( $this->section == 'new' ) {
1972                                 // Handle the user preference to force summaries here
1973                                 if ( !$this->allowBlankSummary && trim( $this->summary ) == '' ) {
1974                                         $this->missingSummary = true;
1975                                         $status->fatal( 'missingsummary' ); // or 'missingcommentheader' if $section == 'new'. Blegh
1976                                         $status->value = self::AS_SUMMARY_NEEDED;
1977                                         return $status;
1978                                 }
1979
1980                                 // Do not allow the user to post an empty comment
1981                                 if ( $this->textbox1 == '' ) {
1982                                         $this->missingComment = true;
1983                                         $status->fatal( 'missingcommenttext' );
1984                                         $status->value = self::AS_TEXTBOX_EMPTY;
1985                                         return $status;
1986                                 }
1987                         } elseif ( !$this->allowBlankSummary
1988                                 && !$content->equals( $this->getOriginalContent( $wgUser ) )
1989                                 && !$content->isRedirect()
1990                                 && md5( $this->summary ) == $this->autoSumm
1991                         ) {
1992                                 $this->missingSummary = true;
1993                                 $status->fatal( 'missingsummary' );
1994                                 $status->value = self::AS_SUMMARY_NEEDED;
1995                                 return $status;
1996                         }
1997
1998                         # All's well
1999                         $sectionanchor = '';
2000                         if ( $this->section == 'new' ) {
2001                                 $this->summary = $this->newSectionSummary( $sectionanchor );
2002                         } elseif ( $this->section != '' ) {
2003                                 # Try to get a section anchor from the section source, redirect
2004                                 # to edited section if header found.
2005                                 # XXX: Might be better to integrate this into Article::replaceSectionAtRev
2006                                 # for duplicate heading checking and maybe parsing.
2007                                 $hasmatch = preg_match( "/^ *([=]{1,6})(.*?)(\\1) *\\n/i", $this->textbox1, $matches );
2008                                 # We can't deal with anchors, includes, html etc in the header for now,
2009                                 # headline would need to be parsed to improve this.
2010                                 if ( $hasmatch && strlen( $matches[2] ) > 0 ) {
2011                                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $matches[2] );
2012                                 }
2013                         }
2014                         $result['sectionanchor'] = $sectionanchor;
2015
2016                         // Save errors may fall down to the edit form, but we've now
2017                         // merged the section into full text. Clear the section field
2018                         // so that later submission of conflict forms won't try to
2019                         // replace that into a duplicated mess.
2020                         $this->textbox1 = $this->toEditText( $content );
2021                         $this->section = '';
2022
2023                         $status->value = self::AS_SUCCESS_UPDATE;
2024                 }
2025
2026                 if ( !$this->allowSelfRedirect
2027                         && $content->isRedirect()
2028                         && $content->getRedirectTarget()->equals( $this->getTitle() )
2029                 ) {
2030                         // If the page already redirects to itself, don't warn.
2031                         $currentTarget = $this->getCurrentContent()->getRedirectTarget();
2032                         if ( !$currentTarget || !$currentTarget->equals( $this->getTitle() ) ) {
2033                                 $this->selfRedirect = true;
2034                                 $status->fatal( 'selfredirect' );
2035                                 $status->value = self::AS_SELF_REDIRECT;
2036                                 return $status;
2037                         }
2038                 }
2039
2040                 // Check for length errors again now that the section is merged in
2041                 $this->kblength = (int)( strlen( $this->toEditText( $content ) ) / 1024 );
2042                 if ( $this->kblength > $wgMaxArticleSize ) {
2043                         $this->tooBig = true;
2044                         $status->setResult( false, self::AS_MAX_ARTICLE_SIZE_EXCEEDED );
2045                         return $status;
2046                 }
2047
2048                 $flags = EDIT_AUTOSUMMARY |
2049                         ( $new ? EDIT_NEW : EDIT_UPDATE ) |
2050                         ( ( $this->minoredit && !$this->isNew ) ? EDIT_MINOR : 0 ) |
2051                         ( $bot ? EDIT_FORCE_BOT : 0 );
2052
2053                 $doEditStatus = $this->page->doEditContent(
2054                         $content,
2055                         $this->summary,
2056                         $flags,
2057                         false,
2058                         $wgUser,
2059                         $content->getDefaultFormat(),
2060                         $this->changeTags
2061                 );
2062
2063                 if ( !$doEditStatus->isOK() ) {
2064                         // Failure from doEdit()
2065                         // Show the edit conflict page for certain recognized errors from doEdit(),
2066                         // but don't show it for errors from extension hooks
2067                         $errors = $doEditStatus->getErrorsArray();
2068                         if ( in_array( $errors[0][0],
2069                                         [ 'edit-gone-missing', 'edit-conflict', 'edit-already-exists' ] )
2070                         ) {
2071                                 $this->isConflict = true;
2072                                 // Destroys data doEdit() put in $status->value but who cares
2073                                 $doEditStatus->value = self::AS_END;
2074                         }
2075                         return $doEditStatus;
2076                 }
2077
2078                 $result['nullEdit'] = $doEditStatus->hasMessage( 'edit-no-change' );
2079                 if ( $result['nullEdit'] ) {
2080                         // We don't know if it was a null edit until now, so increment here
2081                         $wgUser->pingLimiter( 'linkpurge' );
2082                 }
2083                 $result['redirect'] = $content->isRedirect();
2084
2085                 $this->updateWatchlist();
2086
2087                 // If the content model changed, add a log entry
2088                 if ( $changingContentModel ) {
2089                         $this->addContentModelChangeLogEntry(
2090                                 $wgUser,
2091                                 $new ? false : $oldContentModel,
2092                                 $this->contentModel,
2093                                 $this->summary
2094                         );
2095                 }
2096
2097                 return $status;
2098         }
2099
2100         /**
2101          * @param User $user
2102          * @param string|false $oldModel false if the page is being newly created
2103          * @param string $newModel
2104          * @param string $reason
2105          */
2106         protected function addContentModelChangeLogEntry( User $user, $oldModel, $newModel, $reason ) {
2107                 $new = $oldModel === false;
2108                 $log = new ManualLogEntry( 'contentmodel', $new ? 'new' : 'change' );
2109                 $log->setPerformer( $user );
2110                 $log->setTarget( $this->mTitle );
2111                 $log->setComment( $reason );
2112                 $log->setParameters( [
2113                         '4::oldmodel' => $oldModel,
2114                         '5::newmodel' => $newModel
2115                 ] );
2116                 $logid = $log->insert();
2117                 $log->publish( $logid );
2118         }
2119
2120         /**
2121          * Register the change of watch status
2122          */
2123         protected function updateWatchlist() {
2124                 global $wgUser;
2125
2126                 if ( !$wgUser->isLoggedIn() ) {
2127                         return;
2128                 }
2129
2130                 $user = $wgUser;
2131                 $title = $this->mTitle;
2132                 $watch = $this->watchthis;
2133                 // Do this in its own transaction to reduce contention...
2134                 DeferredUpdates::addCallableUpdate( function () use ( $user, $title, $watch ) {
2135                         if ( $watch == $user->isWatched( $title, User::IGNORE_USER_RIGHTS ) ) {
2136                                 return; // nothing to change
2137                         }
2138                         WatchAction::doWatchOrUnwatch( $watch, $title, $user );
2139                 } );
2140         }
2141
2142         /**
2143          * Attempts to do 3-way merge of edit content with a base revision
2144          * and current content, in case of edit conflict, in whichever way appropriate
2145          * for the content type.
2146          *
2147          * @since 1.21
2148          *
2149          * @param Content $editContent
2150          *
2151          * @return bool
2152          */
2153         private function mergeChangesIntoContent( &$editContent ) {
2154
2155                 $db = wfGetDB( DB_MASTER );
2156
2157                 // This is the revision the editor started from
2158                 $baseRevision = $this->getBaseRevision();
2159                 $baseContent = $baseRevision ? $baseRevision->getContent() : null;
2160
2161                 if ( is_null( $baseContent ) ) {
2162                         return false;
2163                 }
2164
2165                 // The current state, we want to merge updates into it
2166                 $currentRevision = Revision::loadFromTitle( $db, $this->mTitle );
2167                 $currentContent = $currentRevision ? $currentRevision->getContent() : null;
2168
2169                 if ( is_null( $currentContent ) ) {
2170                         return false;
2171                 }
2172
2173                 $handler = ContentHandler::getForModelID( $baseContent->getModel() );
2174
2175                 $result = $handler->merge3( $baseContent, $editContent, $currentContent );
2176
2177                 if ( $result ) {
2178                         $editContent = $result;
2179                         // Update parentRevId to what we just merged.
2180                         $this->parentRevId = $currentRevision->getId();
2181                         return true;
2182                 }
2183
2184                 return false;
2185         }
2186
2187         /**
2188          * @note: this method is very poorly named. If the user opened the form with ?oldid=X,
2189          *        one might think of X as the "base revision", which is NOT what this returns.
2190          * @return Revision Current version when the edit was started
2191          */
2192         function getBaseRevision() {
2193                 if ( !$this->mBaseRevision ) {
2194                         $db = wfGetDB( DB_MASTER );
2195                         $this->mBaseRevision = $this->editRevId
2196                                 ? Revision::newFromId( $this->editRevId, Revision::READ_LATEST )
2197                                 : Revision::loadFromTimestamp( $db, $this->mTitle, $this->edittime );
2198                 }
2199                 return $this->mBaseRevision;
2200         }
2201
2202         /**
2203          * Check given input text against $wgSpamRegex, and return the text of the first match.
2204          *
2205          * @param string $text
2206          *
2207          * @return string|bool Matching string or false
2208          */
2209         public static function matchSpamRegex( $text ) {
2210                 global $wgSpamRegex;
2211                 // For back compatibility, $wgSpamRegex may be a single string or an array of regexes.
2212                 $regexes = (array)$wgSpamRegex;
2213                 return self::matchSpamRegexInternal( $text, $regexes );
2214         }
2215
2216         /**
2217          * Check given input text against $wgSummarySpamRegex, and return the text of the first match.
2218          *
2219          * @param string $text
2220          *
2221          * @return string|bool Matching string or false
2222          */
2223         public static function matchSummarySpamRegex( $text ) {
2224                 global $wgSummarySpamRegex;
2225                 $regexes = (array)$wgSummarySpamRegex;
2226                 return self::matchSpamRegexInternal( $text, $regexes );
2227         }
2228
2229         /**
2230          * @param string $text
2231          * @param array $regexes
2232          * @return bool|string
2233          */
2234         protected static function matchSpamRegexInternal( $text, $regexes ) {
2235                 foreach ( $regexes as $regex ) {
2236                         $matches = [];
2237                         if ( preg_match( $regex, $text, $matches ) ) {
2238                                 return $matches[0];
2239                         }
2240                 }
2241                 return false;
2242         }
2243
2244         function setHeaders() {
2245                 global $wgOut, $wgUser, $wgAjaxEditStash;
2246
2247                 $wgOut->addModules( 'mediawiki.action.edit' );
2248                 $wgOut->addModuleStyles( 'mediawiki.action.edit.styles' );
2249
2250                 if ( $wgUser->getOption( 'showtoolbar' ) ) {
2251                         // The addition of default buttons is handled by getEditToolbar() which
2252                         // has its own dependency on this module. The call here ensures the module
2253                         // is loaded in time (it has position "top") for other modules to register
2254                         // buttons (e.g. extensions, gadgets, user scripts).
2255                         $wgOut->addModules( 'mediawiki.toolbar' );
2256                 }
2257
2258                 if ( $wgUser->getOption( 'uselivepreview' ) ) {
2259                         $wgOut->addModules( 'mediawiki.action.edit.preview' );
2260                 }
2261
2262                 if ( $wgUser->getOption( 'useeditwarning' ) ) {
2263                         $wgOut->addModules( 'mediawiki.action.edit.editWarning' );
2264                 }
2265
2266                 if ( $wgAjaxEditStash ) {
2267                         $wgOut->addModules( 'mediawiki.action.edit.stash' );
2268                 }
2269
2270                 # Enabled article-related sidebar, toplinks, etc.
2271                 $wgOut->setArticleRelated( true );
2272
2273                 $contextTitle = $this->getContextTitle();
2274                 if ( $this->isConflict ) {
2275                         $msg = 'editconflict';
2276                 } elseif ( $contextTitle->exists() && $this->section != '' ) {
2277                         $msg = $this->section == 'new' ? 'editingcomment' : 'editingsection';
2278                 } else {
2279                         $msg = $contextTitle->exists()
2280                                 || ( $contextTitle->getNamespace() == NS_MEDIAWIKI
2281                                         && $contextTitle->getDefaultMessageText() !== false
2282                                 )
2283                                 ? 'editing'
2284                                 : 'creating';
2285                 }
2286
2287                 # Use the title defined by DISPLAYTITLE magic word when present
2288                 # NOTE: getDisplayTitle() returns HTML while getPrefixedText() returns plain text.
2289                 #       setPageTitle() treats the input as wikitext, which should be safe in either case.
2290                 $displayTitle = isset( $this->mParserOutput ) ? $this->mParserOutput->getDisplayTitle() : false;
2291                 if ( $displayTitle === false ) {
2292                         $displayTitle = $contextTitle->getPrefixedText();
2293                 }
2294                 $wgOut->setPageTitle( wfMessage( $msg, $displayTitle ) );
2295                 # Transmit the name of the message to JavaScript for live preview
2296                 # Keep Resources.php/mediawiki.action.edit.preview in sync with the possible keys
2297                 $wgOut->addJsConfigVars( 'wgEditMessage', $msg );
2298         }
2299
2300         /**
2301          * Show all applicable editing introductions
2302          */
2303         protected function showIntro() {
2304                 global $wgOut, $wgUser;
2305                 if ( $this->suppressIntro ) {
2306                         return;
2307                 }
2308
2309                 $namespace = $this->mTitle->getNamespace();
2310
2311                 if ( $namespace == NS_MEDIAWIKI ) {
2312                         # Show a warning if editing an interface message
2313                         $wgOut->wrapWikiMsg( "<div class='mw-editinginterface'>\n$1\n</div>", 'editinginterface' );
2314                         # If this is a default message (but not css or js),
2315                         # show a hint that it is translatable on translatewiki.net
2316                         if ( !$this->mTitle->hasContentModel( CONTENT_MODEL_CSS )
2317                                 && !$this->mTitle->hasContentModel( CONTENT_MODEL_JAVASCRIPT )
2318                         ) {
2319                                 $defaultMessageText = $this->mTitle->getDefaultMessageText();
2320                                 if ( $defaultMessageText !== false ) {
2321                                         $wgOut->wrapWikiMsg( "<div class='mw-translateinterface'>\n$1\n</div>",
2322                                                 'translateinterface' );
2323                                 }
2324                         }
2325                 } elseif ( $namespace == NS_FILE ) {
2326                         # Show a hint to shared repo
2327                         $file = wfFindFile( $this->mTitle );
2328                         if ( $file && !$file->isLocal() ) {
2329                                 $descUrl = $file->getDescriptionUrl();
2330                                 # there must be a description url to show a hint to shared repo
2331                                 if ( $descUrl ) {
2332                                         if ( !$this->mTitle->exists() ) {
2333                                                 $wgOut->wrapWikiMsg( "<div class=\"mw-sharedupload-desc-create\">\n$1\n</div>", [
2334                                                                         'sharedupload-desc-create', $file->getRepo()->getDisplayName(), $descUrl
2335                                                 ] );
2336                                         } else {
2337                                                 $wgOut->wrapWikiMsg( "<div class=\"mw-sharedupload-desc-edit\">\n$1\n</div>", [
2338                                                                         'sharedupload-desc-edit', $file->getRepo()->getDisplayName(), $descUrl
2339                                                 ] );
2340                                         }
2341                                 }
2342                         }
2343                 }
2344
2345                 # Show a warning message when someone creates/edits a user (talk) page but the user does not exist
2346                 # Show log extract when the user is currently blocked
2347                 if ( $namespace == NS_USER || $namespace == NS_USER_TALK ) {
2348                         $username = explode( '/', $this->mTitle->getText(), 2 )[0];
2349                         $user = User::newFromName( $username, false /* allow IP users*/ );
2350                         $ip = User::isIP( $username );
2351                         $block = Block::newFromTarget( $user, $user );
2352                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
2353                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n$1\n</div>",
2354                                         [ 'userpage-userdoesnotexist', wfEscapeWikiText( $username ) ] );
2355                         } elseif ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) {
2356                                 # Show log extract if the user is currently blocked
2357                                 LogEventsList::showLogExtract(
2358                                         $wgOut,
2359                                         'block',
2360                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
2361                                         '',
2362                                         [
2363                                                 'lim' => 1,
2364                                                 'showIfEmpty' => false,
2365                                                 'msgKey' => [
2366                                                         'blocked-notice-logextract',
2367                                                         $user->getName() # Support GENDER in notice
2368                                                 ]
2369                                         ]
2370                                 );
2371                         }
2372                 }
2373                 # Try to add a custom edit intro, or use the standard one if this is not possible.
2374                 if ( !$this->showCustomIntro() && !$this->mTitle->exists() ) {
2375                         $helpLink = wfExpandUrl( Skin::makeInternalOrExternalUrl(
2376                                 wfMessage( 'helppage' )->inContentLanguage()->text()
2377                         ) );
2378                         if ( $wgUser->isLoggedIn() ) {
2379                                 $wgOut->wrapWikiMsg(
2380                                         // Suppress the external link icon, consider the help url an internal one
2381                                         "<div class=\"mw-newarticletext plainlinks\">\n$1\n</div>",
2382                                         [
2383                                                 'newarticletext',
2384                                                 $helpLink
2385                                         ]
2386                                 );
2387                         } else {
2388                                 $wgOut->wrapWikiMsg(
2389                                         // Suppress the external link icon, consider the help url an internal one
2390                                         "<div class=\"mw-newarticletextanon plainlinks\">\n$1\n</div>",
2391                                         [
2392                                                 'newarticletextanon',
2393                                                 $helpLink
2394                                         ]
2395                                 );
2396                         }
2397                 }
2398                 # Give a notice if the user is editing a deleted/moved page...
2399                 if ( !$this->mTitle->exists() ) {
2400                         LogEventsList::showLogExtract( $wgOut, [ 'delete', 'move' ], $this->mTitle,
2401                                 '',
2402                                 [
2403                                         'lim' => 10,
2404                                         'conds' => [ "log_action != 'revision'" ],
2405                                         'showIfEmpty' => false,
2406                                         'msgKey' => [ 'recreate-moveddeleted-warn' ]
2407                                 ]
2408                         );
2409                 }
2410         }
2411
2412         /**
2413          * Attempt to show a custom editing introduction, if supplied
2414          *
2415          * @return bool
2416          */
2417         protected function showCustomIntro() {
2418                 if ( $this->editintro ) {
2419                         $title = Title::newFromText( $this->editintro );
2420                         if ( $title instanceof Title && $title->exists() && $title->userCan( 'read' ) ) {
2421                                 global $wgOut;
2422                                 // Added using template syntax, to take <noinclude>'s into account.
2423                                 $wgOut->addWikiTextTitleTidy(
2424                                         '<div class="mw-editintro">{{:' . $title->getFullText() . '}}</div>',
2425                                         $this->mTitle
2426                                 );
2427                                 return true;
2428                         }
2429                 }
2430                 return false;
2431         }
2432
2433         /**
2434          * Gets an editable textual representation of $content.
2435          * The textual representation can be turned by into a Content object by the
2436          * toEditContent() method.
2437          *
2438          * If $content is null or false or a string, $content is returned unchanged.
2439          *
2440          * If the given Content object is not of a type that can be edited using
2441          * the text base EditPage, an exception will be raised. Set
2442          * $this->allowNonTextContent to true to allow editing of non-textual
2443          * content.
2444          *
2445          * @param Content|null|bool|string $content
2446          * @return string The editable text form of the content.
2447          *
2448          * @throws MWException If $content is not an instance of TextContent and
2449          *   $this->allowNonTextContent is not true.
2450          */
2451         protected function toEditText( $content ) {
2452                 if ( $content === null || $content === false || is_string( $content ) ) {
2453                         return $content;
2454                 }
2455
2456                 if ( !$this->isSupportedContentModel( $content->getModel() ) ) {
2457                         throw new MWException( 'This content model is not supported: '
2458                                 . ContentHandler::getLocalizedName( $content->getModel() ) );
2459                 }
2460
2461                 return $content->serialize( $this->contentFormat );
2462         }
2463
2464         /**
2465          * Turns the given text into a Content object by unserializing it.
2466          *
2467          * If the resulting Content object is not of a type that can be edited using
2468          * the text base EditPage, an exception will be raised. Set
2469          * $this->allowNonTextContent to true to allow editing of non-textual
2470          * content.
2471          *
2472          * @param string|null|bool $text Text to unserialize
2473          * @return Content The content object created from $text. If $text was false
2474          *   or null, false resp. null will be  returned instead.
2475          *
2476          * @throws MWException If unserializing the text results in a Content
2477          *   object that is not an instance of TextContent and
2478          *   $this->allowNonTextContent is not true.
2479          */
2480         protected function toEditContent( $text ) {
2481                 if ( $text === false || $text === null ) {
2482                         return $text;
2483                 }
2484
2485                 $content = ContentHandler::makeContent( $text, $this->getTitle(),
2486                         $this->contentModel, $this->contentFormat );
2487
2488                 if ( !$this->isSupportedContentModel( $content->getModel() ) ) {
2489                         throw new MWException( 'This content model is not supported: '
2490                                 . ContentHandler::getLocalizedName( $content->getModel() ) );
2491                 }
2492
2493                 return $content;
2494         }
2495
2496         /**
2497          * Send the edit form and related headers to $wgOut
2498          * @param callable|null $formCallback That takes an OutputPage parameter; will be called
2499          *     during form output near the top, for captchas and the like.
2500          *
2501          * The $formCallback parameter is deprecated since MediaWiki 1.25. Please
2502          * use the EditPage::showEditForm:fields hook instead.
2503          */
2504         function showEditForm( $formCallback = null ) {
2505                 global $wgOut, $wgUser;
2506
2507                 # need to parse the preview early so that we know which templates are used,
2508                 # otherwise users with "show preview after edit box" will get a blank list
2509                 # we parse this near the beginning so that setHeaders can do the title
2510                 # setting work instead of leaving it in getPreviewText
2511                 $previewOutput = '';
2512                 if ( $this->formtype == 'preview' ) {
2513                         $previewOutput = $this->getPreviewText();
2514                 }
2515
2516                 Hooks::run( 'EditPage::showEditForm:initial', [ &$this, &$wgOut ] );
2517
2518                 $this->setHeaders();
2519
2520                 if ( $this->showHeader() === false ) {
2521                         return;
2522                 }
2523
2524                 $wgOut->addHTML( $this->editFormPageTop );
2525
2526                 if ( $wgUser->getOption( 'previewontop' ) ) {
2527                         $this->displayPreviewArea( $previewOutput, true );
2528                 }
2529
2530                 $wgOut->addHTML( $this->editFormTextTop );
2531
2532                 $showToolbar = true;
2533                 if ( $this->wasDeletedSinceLastEdit() ) {
2534                         if ( $this->formtype == 'save' ) {
2535                                 // Hide the toolbar and edit area, user can click preview to get it back
2536                                 // Add an confirmation checkbox and explanation.
2537                                 $showToolbar = false;
2538                         } else {
2539                                 $wgOut->wrapWikiMsg( "<div class='error mw-deleted-while-editing'>\n$1\n</div>",
2540                                         'deletedwhileediting' );
2541                         }
2542                 }
2543
2544                 // @todo add EditForm plugin interface and use it here!
2545                 //       search for textarea1 and textares2, and allow EditForm to override all uses.
2546                 $wgOut->addHTML( Html::openElement(
2547                         'form',
2548                         [
2549                                 'id' => self::EDITFORM_ID,
2550                                 'name' => self::EDITFORM_ID,
2551                                 'method' => 'post',
2552                                 'action' => $this->getActionURL( $this->getContextTitle() ),
2553                                 'enctype' => 'multipart/form-data'
2554                         ]
2555                 ) );
2556
2557                 if ( is_callable( $formCallback ) ) {
2558                         wfWarn( 'The $formCallback parameter to ' . __METHOD__ . 'is deprecated' );
2559                         call_user_func_array( $formCallback, [ &$wgOut ] );
2560                 }
2561
2562                 // Add an empty field to trip up spambots
2563                 $wgOut->addHTML(
2564                         Xml::openElement( 'div', [ 'id' => 'antispam-container', 'style' => 'display: none;' ] )
2565                         . Html::rawElement(
2566                                 'label',
2567                                 [ 'for' => 'wpAntispam' ],
2568                                 wfMessage( 'simpleantispam-label' )->parse()
2569                         )
2570                         . Xml::element(
2571                                 'input',
2572                                 [
2573                                         'type' => 'text',
2574                                         'name' => 'wpAntispam',
2575                                         'id' => 'wpAntispam',
2576                                         'value' => ''
2577                                 ]
2578                         )
2579                         . Xml::closeElement( 'div' )
2580                 );
2581
2582                 Hooks::run( 'EditPage::showEditForm:fields', [ &$this, &$wgOut ] );
2583
2584                 // Put these up at the top to ensure they aren't lost on early form submission
2585                 $this->showFormBeforeText();
2586
2587                 if ( $this->wasDeletedSinceLastEdit() && 'save' == $this->formtype ) {
2588                         $username = $this->lastDelete->user_name;
2589                         $comment = $this->lastDelete->log_comment;
2590
2591                         // It is better to not parse the comment at all than to have templates expanded in the middle
2592                         // TODO: can the checkLabel be moved outside of the div so that wrapWikiMsg could be used?
2593                         $key = $comment === ''
2594                                 ? 'confirmrecreate-noreason'
2595                                 : 'confirmrecreate';
2596                         $wgOut->addHTML(
2597                                 '<div class="mw-confirm-recreate">' .
2598                                         wfMessage( $key, $username, "<nowiki>$comment</nowiki>" )->parse() .
2599                                 Xml::checkLabel( wfMessage( 'recreate' )->text(), 'wpRecreate', 'wpRecreate', false,
2600                                         [ 'title' => Linker::titleAttrib( 'recreate' ), 'tabindex' => 1, 'id' => 'wpRecreate' ]
2601                                 ) .
2602                                 '</div>'
2603                         );
2604                 }
2605
2606                 # When the summary is hidden, also hide them on preview/show changes
2607                 if ( $this->nosummary ) {
2608                         $wgOut->addHTML( Html::hidden( 'nosummary', true ) );
2609                 }
2610
2611                 # If a blank edit summary was previously provided, and the appropriate
2612                 # user preference is active, pass a hidden tag as wpIgnoreBlankSummary. This will stop the
2613                 # user being bounced back more than once in the event that a summary
2614                 # is not required.
2615                 # ####
2616                 # For a bit more sophisticated detection of blank summaries, hash the
2617                 # automatic one and pass that in the hidden field wpAutoSummary.
2618                 if ( $this->missingSummary || ( $this->section == 'new' && $this->nosummary ) ) {
2619                         $wgOut->addHTML( Html::hidden( 'wpIgnoreBlankSummary', true ) );
2620                 }
2621
2622                 if ( $this->undidRev ) {
2623                         $wgOut->addHTML( Html::hidden( 'wpUndidRevision', $this->undidRev ) );
2624                 }
2625
2626                 if ( $this->selfRedirect ) {
2627                         $wgOut->addHTML( Html::hidden( 'wpIgnoreSelfRedirect', true ) );
2628                 }
2629
2630                 if ( $this->hasPresetSummary ) {
2631                         // If a summary has been preset using &summary= we don't want to prompt for
2632                         // a different summary. Only prompt for a summary if the summary is blanked.
2633                         // (Bug 17416)
2634                         $this->autoSumm = md5( '' );
2635                 }
2636
2637                 $autosumm = $this->autoSumm ? $this->autoSumm : md5( $this->summary );
2638                 $wgOut->addHTML( Html::hidden( 'wpAutoSummary', $autosumm ) );
2639
2640                 $wgOut->addHTML( Html::hidden( 'oldid', $this->oldid ) );
2641                 $wgOut->addHTML( Html::hidden( 'parentRevId', $this->getParentRevId() ) );
2642
2643                 $wgOut->addHTML( Html::hidden( 'format', $this->contentFormat ) );
2644                 $wgOut->addHTML( Html::hidden( 'model', $this->contentModel ) );
2645
2646                 if ( $this->section == 'new' ) {
2647                         $this->showSummaryInput( true, $this->summary );
2648                         $wgOut->addHTML( $this->getSummaryPreview( true, $this->summary ) );
2649                 }
2650
2651                 $wgOut->addHTML( $this->editFormTextBeforeContent );
2652
2653                 if ( !$this->isCssJsSubpage && $showToolbar && $wgUser->getOption( 'showtoolbar' ) ) {
2654                         $wgOut->addHTML( EditPage::getEditToolbar( $this->mTitle ) );
2655                 }
2656
2657                 if ( $this->blankArticle ) {
2658                         $wgOut->addHTML( Html::hidden( 'wpIgnoreBlankArticle', true ) );
2659                 }
2660
2661                 if ( $this->isConflict ) {
2662                         // In an edit conflict bypass the overridable content form method
2663                         // and fallback to the raw wpTextbox1 since editconflicts can't be
2664                         // resolved between page source edits and custom ui edits using the
2665                         // custom edit ui.
2666                         $this->textbox2 = $this->textbox1;
2667
2668                         $content = $this->getCurrentContent();
2669                         $this->textbox1 = $this->toEditText( $content );
2670
2671                         $this->showTextbox1();
2672                 } else {
2673                         $this->showContentForm();
2674                 }
2675
2676                 $wgOut->addHTML( $this->editFormTextAfterContent );
2677
2678                 $this->showStandardInputs();
2679
2680                 $this->showFormAfterText();
2681
2682                 $this->showTosSummary();
2683
2684                 $this->showEditTools();
2685
2686                 $wgOut->addHTML( $this->editFormTextAfterTools . "\n" );
2687
2688                 $wgOut->addHTML( Html::rawElement( 'div', [ 'class' => 'templatesUsed' ],
2689                         Linker::formatTemplates( $this->getTemplates(), $this->preview, $this->section != '' ) ) );
2690
2691                 $wgOut->addHTML( Html::rawElement( 'div', [ 'class' => 'hiddencats' ],
2692                         Linker::formatHiddenCategories( $this->page->getHiddenCategories() ) ) );
2693
2694                 $wgOut->addHTML( Html::rawElement( 'div', [ 'class' => 'limitreport' ],
2695                         self::getPreviewLimitReport( $this->mParserOutput ) ) );
2696
2697                 $wgOut->addModules( 'mediawiki.action.edit.collapsibleFooter' );
2698
2699                 if ( $this->isConflict ) {
2700                         try {
2701                                 $this->showConflict();
2702                         } catch ( MWContentSerializationException $ex ) {
2703                                 // this can't really happen, but be nice if it does.
2704                                 $msg = wfMessage(
2705                                         'content-failed-to-parse',
2706                                         $this->contentModel,
2707                                         $this->contentFormat,
2708                                         $ex->getMessage()
2709                                 );
2710                                 $wgOut->addWikiText( '<div class="error">' . $msg->text() . '</div>' );
2711                         }
2712                 }
2713
2714                 // Marker for detecting truncated form data.  This must be the last
2715                 // parameter sent in order to be of use, so do not move me.
2716                 $wgOut->addHTML( Html::hidden( 'wpUltimateParam', true ) );
2717                 $wgOut->addHTML( $this->editFormTextBottom . "\n</form>\n" );
2718
2719                 if ( !$wgUser->getOption( 'previewontop' ) ) {
2720                         $this->displayPreviewArea( $previewOutput, false );
2721                 }
2722
2723         }
2724
2725         /**
2726          * Extract the section title from current section text, if any.
2727          *
2728          * @param string $text
2729          * @return string|bool String or false
2730          */
2731         public static function extractSectionTitle( $text ) {
2732                 preg_match( "/^(=+)(.+)\\1\\s*(\n|$)/i", $text, $matches );
2733                 if ( !empty( $matches[2] ) ) {
2734                         global $wgParser;
2735                         return $wgParser->stripSectionName( trim( $matches[2] ) );
2736                 } else {
2737                         return false;
2738                 }
2739         }
2740
2741         /**
2742          * @return bool
2743          */
2744         protected function showHeader() {
2745                 global $wgOut, $wgUser, $wgMaxArticleSize, $wgLang;
2746                 global $wgAllowUserCss, $wgAllowUserJs;
2747
2748                 if ( $this->mTitle->isTalkPage() ) {
2749                         $wgOut->addWikiMsg( 'talkpagetext' );
2750                 }
2751
2752                 // Add edit notices
2753                 $editNotices = $this->mTitle->getEditNotices( $this->oldid );
2754                 if ( count( $editNotices ) ) {
2755                         $wgOut->addHTML( implode( "\n", $editNotices ) );
2756                 } else {
2757                         $msg = wfMessage( 'editnotice-notext' );
2758                         if ( !$msg->isDisabled() ) {
2759                                 $wgOut->addHTML(
2760                                         '<div class="mw-editnotice-notext">'
2761                                         . $msg->parseAsBlock()
2762                                         . '</div>'
2763                                 );
2764                         }
2765                 }
2766
2767                 if ( $this->isConflict ) {
2768                         $wgOut->wrapWikiMsg( "<div class='mw-explainconflict'>\n$1\n</div>", 'explainconflict' );
2769                         $this->editRevId = $this->page->getLatest();
2770                 } else {
2771                         if ( $this->section != '' && !$this->isSectionEditSupported() ) {
2772                                 // We use $this->section to much before this and getVal('wgSection') directly in other places
2773                                 // at this point we can't reset $this->section to '' to fallback to non-section editing.
2774                                 // Someone is welcome to try refactoring though
2775                                 $wgOut->showErrorPage( 'sectioneditnotsupported-title', 'sectioneditnotsupported-text' );
2776                                 return false;
2777                         }
2778
2779                         if ( $this->section != '' && $this->section != 'new' ) {
2780                                 if ( !$this->summary && !$this->preview && !$this->diff ) {
2781                                         $sectionTitle = self::extractSectionTitle( $this->textbox1 ); // FIXME: use Content object
2782                                         if ( $sectionTitle !== false ) {
2783                                                 $this->summary = "/* $sectionTitle */ ";
2784                                         }
2785                                 }
2786                         }
2787
2788                         if ( $this->missingComment ) {
2789                                 $wgOut->wrapWikiMsg( "<div id='mw-missingcommenttext'>\n$1\n</div>", 'missingcommenttext' );
2790                         }
2791
2792                         if ( $this->missingSummary && $this->section != 'new' ) {
2793                                 $wgOut->wrapWikiMsg( "<div id='mw-missingsummary'>\n$1\n</div>", 'missingsummary' );
2794                         }
2795
2796                         if ( $this->missingSummary && $this->section == 'new' ) {
2797                                 $wgOut->wrapWikiMsg( "<div id='mw-missingcommentheader'>\n$1\n</div>", 'missingcommentheader' );
2798                         }
2799
2800                         if ( $this->blankArticle ) {
2801                                 $wgOut->wrapWikiMsg( "<div id='mw-blankarticle'>\n$1\n</div>", 'blankarticle' );
2802                         }
2803
2804                         if ( $this->selfRedirect ) {
2805                                 $wgOut->wrapWikiMsg( "<div id='mw-selfredirect'>\n$1\n</div>", 'selfredirect' );
2806                         }
2807
2808                         if ( $this->hookError !== '' ) {
2809                                 $wgOut->addWikiText( $this->hookError );
2810                         }
2811
2812                         if ( !$this->checkUnicodeCompliantBrowser() ) {
2813                                 $wgOut->addWikiMsg( 'nonunicodebrowser' );
2814                         }
2815
2816                         if ( $this->section != 'new' ) {
2817                                 $revision = $this->mArticle->getRevisionFetched();
2818                                 if ( $revision ) {
2819                                         // Let sysop know that this will make private content public if saved
2820
2821                                         if ( !$revision->userCan( Revision::DELETED_TEXT, $wgUser ) ) {
2822                                                 $wgOut->wrapWikiMsg(
2823                                                         "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
2824                                                         'rev-deleted-text-permission'
2825                                                 );
2826                                         } elseif ( $revision->isDeleted( Revision::DELETED_TEXT ) ) {
2827                                                 $wgOut->wrapWikiMsg(
2828                                                         "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
2829                                                         'rev-deleted-text-view'
2830                                                 );
2831                                         }
2832
2833                                         if ( !$revision->isCurrent() ) {
2834                                                 $this->mArticle->setOldSubtitle( $revision->getId() );
2835                                                 $wgOut->addWikiMsg( 'editingold' );
2836                                         }
2837                                 } elseif ( $this->mTitle->exists() ) {
2838                                         // Something went wrong
2839
2840                                         $wgOut->wrapWikiMsg( "<div class='errorbox'>\n$1\n</div>\n",
2841                                                 [ 'missing-revision', $this->oldid ] );
2842                                 }
2843                         }
2844                 }
2845
2846                 if ( wfReadOnly() ) {
2847                         $wgOut->wrapWikiMsg(
2848                                 "<div id=\"mw-read-only-warning\">\n$1\n</div>",
2849                                 [ 'readonlywarning', wfReadOnlyReason() ]
2850                         );
2851                 } elseif ( $wgUser->isAnon() ) {
2852                         if ( $this->formtype != 'preview' ) {
2853                                 $wgOut->wrapWikiMsg(
2854                                         "<div id='mw-anon-edit-warning' class='warningbox'>\n$1\n</div>",
2855                                         [ 'anoneditwarning',
2856                                                 // Log-in link
2857                                                 SpecialPage::getTitleFor( 'Userlogin' )->getFullURL( [
2858                                                         'returnto' => $this->getTitle()->getPrefixedDBkey()
2859                                                 ] ),
2860                                                 // Sign-up link
2861                                                 SpecialPage::getTitleFor( 'CreateAccount' )->getFullURL( [
2862                                                         'returnto' => $this->getTitle()->getPrefixedDBkey()
2863                                                 ] )
2864                                         ]
2865                                 );
2866                         } else {
2867                                 $wgOut->wrapWikiMsg( "<div id=\"mw-anon-preview-warning\" class=\"warningbox\">\n$1</div>",
2868                                         'anonpreviewwarning'
2869                                 );
2870                         }
2871                 } else {
2872                         if ( $this->isCssJsSubpage ) {
2873                                 # Check the skin exists
2874                                 if ( $this->isWrongCaseCssJsPage ) {
2875                                         $wgOut->wrapWikiMsg(
2876                                                 "<div class='error' id='mw-userinvalidcssjstitle'>\n$1\n</div>",
2877                                                 [ 'userinvalidcssjstitle', $this->mTitle->getSkinFromCssJsSubpage() ]
2878                                         );
2879                                 }
2880                                 if ( $this->getTitle()->isSubpageOf( $wgUser->getUserPage() ) ) {
2881                                         if ( $this->formtype !== 'preview' ) {
2882                                                 if ( $this->isCssSubpage && $wgAllowUserCss ) {
2883                                                         $wgOut->wrapWikiMsg(
2884                                                                 "<div id='mw-usercssyoucanpreview'>\n$1\n</div>",
2885                                                                 [ 'usercssyoucanpreview' ]
2886                                                         );
2887                                                 }
2888
2889                                                 if ( $this->isJsSubpage && $wgAllowUserJs ) {
2890                                                         $wgOut->wrapWikiMsg(
2891                                                                 "<div id='mw-userjsyoucanpreview'>\n$1\n</div>",
2892                                                                 [ 'userjsyoucanpreview' ]
2893                                                         );
2894                                                 }
2895                                         }
2896                                 }
2897                         }
2898                 }
2899
2900                 if ( $this->mTitle->isProtected( 'edit' ) &&
2901                         MWNamespace::getRestrictionLevels( $this->mTitle->getNamespace() ) !== [ '' ]
2902                 ) {
2903                         # Is the title semi-protected?
2904                         if ( $this->mTitle->isSemiProtected() ) {
2905                                 $noticeMsg = 'semiprotectedpagewarning';
2906                         } else {
2907                                 # Then it must be protected based on static groups (regular)
2908                                 $noticeMsg = 'protectedpagewarning';
2909                         }
2910                         LogEventsList::showLogExtract( $wgOut, 'protect', $this->mTitle, '',
2911                                 [ 'lim' => 1, 'msgKey' => [ $noticeMsg ] ] );
2912                 }
2913                 if ( $this->mTitle->isCascadeProtected() ) {
2914                         # Is this page under cascading protection from some source pages?
2915                         /** @var Title[] $cascadeSources */
2916                         list( $cascadeSources, /* $restrictions */ ) = $this->mTitle->getCascadeProtectionSources();
2917                         $notice = "<div class='mw-cascadeprotectedwarning'>\n$1\n";
2918                         $cascadeSourcesCount = count( $cascadeSources );
2919                         if ( $cascadeSourcesCount > 0 ) {
2920                                 # Explain, and list the titles responsible
2921                                 foreach ( $cascadeSources as $page ) {
2922                                         $notice .= '* [[:' . $page->getPrefixedText() . "]]\n";
2923                                 }
2924                         }
2925                         $notice .= '</div>';
2926                         $wgOut->wrapWikiMsg( $notice, [ 'cascadeprotectedwarning', $cascadeSourcesCount ] );
2927                 }
2928                 if ( !$this->mTitle->exists() && $this->mTitle->getRestrictions( 'create' ) ) {
2929                         LogEventsList::showLogExtract( $wgOut, 'protect', $this->mTitle, '',
2930                                 [ 'lim' => 1,
2931                                         'showIfEmpty' => false,
2932                                         'msgKey' => [ 'titleprotectedwarning' ],
2933                                         'wrap' => "<div class=\"mw-titleprotectedwarning\">\n$1</div>" ] );
2934                 }
2935
2936                 if ( $this->kblength === false ) {
2937                         $this->kblength = (int)( strlen( $this->textbox1 ) / 1024 );
2938                 }
2939
2940                 if ( $this->tooBig || $this->kblength > $wgMaxArticleSize ) {
2941                         $wgOut->wrapWikiMsg( "<div class='error' id='mw-edit-longpageerror'>\n$1\n</div>",
2942                                 [
2943                                         'longpageerror',
2944                                         $wgLang->formatNum( $this->kblength ),
2945                                         $wgLang->formatNum( $wgMaxArticleSize )
2946                                 ]
2947                         );
2948                 } else {
2949                         if ( !wfMessage( 'longpage-hint' )->isDisabled() ) {
2950                                 $wgOut->wrapWikiMsg( "<div id='mw-edit-longpage-hint'>\n$1\n</div>",
2951                                         [
2952                                                 'longpage-hint',
2953                                                 $wgLang->formatSize( strlen( $this->textbox1 ) ),
2954                                                 strlen( $this->textbox1 )
2955                                         ]
2956                                 );
2957                         }
2958                 }
2959                 # Add header copyright warning
2960                 $this->showHeaderCopyrightWarning();
2961
2962                 return true;
2963         }
2964
2965         /**
2966          * Standard summary input and label (wgSummary), abstracted so EditPage
2967          * subclasses may reorganize the form.
2968          * Note that you do not need to worry about the label's for=, it will be
2969          * inferred by the id given to the input. You can remove them both by
2970          * passing array( 'id' => false ) to $userInputAttrs.
2971          *
2972          * @param string $summary The value of the summary input
2973          * @param string $labelText The html to place inside the label
2974          * @param array $inputAttrs Array of attrs to use on the input
2975          * @param array $spanLabelAttrs Array of attrs to use on the span inside the label
2976          *
2977          * @return array An array in the format array( $label, $input )
2978          */
2979         function getSummaryInput( $summary = "", $labelText = null,
2980                 $inputAttrs = null, $spanLabelAttrs = null
2981         ) {
2982                 // Note: the maxlength is overridden in JS to 255 and to make it use UTF-8 bytes, not characters.
2983                 $inputAttrs = ( is_array( $inputAttrs ) ? $inputAttrs : [] ) + [
2984                         'id' => 'wpSummary',
2985                         'maxlength' => '200',
2986                         'tabindex' => '1',
2987                         'size' => 60,
2988                         'spellcheck' => 'true',
2989                 ] + Linker::tooltipAndAccesskeyAttribs( 'summary' );
2990
2991                 $spanLabelAttrs = ( is_array( $spanLabelAttrs ) ? $spanLabelAttrs : [] ) + [
2992                         'class' => $this->missingSummary ? 'mw-summarymissed' : 'mw-summary',
2993                         'id' => "wpSummaryLabel"
2994                 ];
2995
2996                 $label = null;
2997                 if ( $labelText ) {
2998                         $label = Xml::tags(
2999                                 'label',
3000                                 $inputAttrs['id'] ? [ 'for' => $inputAttrs['id'] ] : null,
3001                                 $labelText
3002                         );
3003                         $label = Xml::tags( 'span', $spanLabelAttrs, $label );
3004                 }
3005
3006                 $input = Html::input( 'wpSummary', $summary, 'text', $inputAttrs );
3007
3008                 return [ $label, $input ];
3009         }
3010
3011         /**
3012          * @param bool $isSubjectPreview True if this is the section subject/title
3013          *   up top, or false if this is the comment summary
3014          *   down below the textarea
3015          * @param string $summary The text of the summary to display
3016          */
3017         protected function showSummaryInput( $isSubjectPreview, $summary = "" ) {
3018                 global $wgOut, $wgContLang;
3019                 # Add a class if 'missingsummary' is triggered to allow styling of the summary line
3020                 $summaryClass = $this->missingSummary ? 'mw-summarymissed' : 'mw-summary';
3021                 if ( $isSubjectPreview ) {
3022                         if ( $this->nosummary ) {
3023                                 return;
3024                         }
3025                 } else {
3026                         if ( !$this->mShowSummaryField ) {
3027                                 return;
3028                         }
3029                 }
3030                 $summary = $wgContLang->recodeForEdit( $summary );
3031                 $labelText = wfMessage( $isSubjectPreview ? 'subject' : 'summary' )->parse();
3032                 list( $label, $input ) = $this->getSummaryInput(
3033                         $summary,
3034                         $labelText,
3035                         [ 'class' => $summaryClass ],
3036                         []
3037                 );
3038                 $wgOut->addHTML( "{$label} {$input}" );
3039         }
3040
3041         /**
3042          * @param bool $isSubjectPreview True if this is the section subject/title
3043          *   up top, or false if this is the comment summary
3044          *   down below the textarea
3045          * @param string $summary The text of the summary to display
3046          * @return string
3047          */
3048         protected function getSummaryPreview( $isSubjectPreview, $summary = "" ) {
3049                 // avoid spaces in preview, gets always trimmed on save
3050                 $summary = trim( $summary );
3051                 if ( !$summary || ( !$this->preview && !$this->diff ) ) {
3052                         return "";
3053                 }
3054
3055                 global $wgParser;
3056
3057                 if ( $isSubjectPreview ) {
3058                         $summary = wfMessage( 'newsectionsummary' )->rawParams( $wgParser->stripSectionName( $summary ) )
3059                                 ->inContentLanguage()->text();
3060                 }
3061
3062                 $message = $isSubjectPreview ? 'subject-preview' : 'summary-preview';
3063
3064                 $summary = wfMessage( $message )->parse()
3065                         . Linker::commentBlock( $summary, $this->mTitle, $isSubjectPreview );
3066                 return Xml::tags( 'div', [ 'class' => 'mw-summary-preview' ], $summary );
3067         }
3068
3069         protected function showFormBeforeText() {
3070                 global $wgOut;
3071                 $section = htmlspecialchars( $this->section );
3072                 $wgOut->addHTML( <<<HTML
3073 <input type='hidden' value="{$section}" name="wpSection"/>
3074 <input type='hidden' value="{$this->starttime}" name="wpStarttime" />
3075 <input type='hidden' value="{$this->edittime}" name="wpEdittime" />
3076 <input type='hidden' value="{$this->editRevId}" name="editRevId" />
3077 <input type='hidden' value="{$this->scrolltop}" name="wpScrolltop" id="wpScrolltop" />
3078
3079 HTML
3080                 );
3081                 if ( !$this->checkUnicodeCompliantBrowser() ) {
3082                         $wgOut->addHTML( Html::hidden( 'safemode', '1' ) );
3083                 }
3084         }
3085
3086         protected function showFormAfterText() {
3087                 global $wgOut, $wgUser;
3088                 /**
3089                  * To make it harder for someone to slip a user a page
3090                  * which submits an edit form to the wiki without their
3091                  * knowledge, a random token is associated with the login
3092                  * session. If it's not passed back with the submission,
3093                  * we won't save the page, or render user JavaScript and
3094                  * CSS previews.
3095                  *
3096                  * For anon editors, who may not have a session, we just
3097                  * include the constant suffix to prevent editing from
3098                  * broken text-mangling proxies.
3099                  */
3100                 $wgOut->addHTML( "\n" . Html::hidden( "wpEditToken", $wgUser->getEditToken() ) . "\n" );
3101         }
3102
3103         /**
3104          * Subpage overridable method for printing the form for page content editing
3105          * By default this simply outputs wpTextbox1
3106          * Subclasses can override this to provide a custom UI for editing;
3107          * be it a form, or simply wpTextbox1 with a modified content that will be
3108          * reverse modified when extracted from the post data.
3109          * Note that this is basically the inverse for importContentFormData
3110          */
3111         protected function showContentForm() {
3112                 $this->showTextbox1();
3113         }
3114
3115         /**
3116          * Method to output wpTextbox1
3117          * The $textoverride method can be used by subclasses overriding showContentForm
3118          * to pass back to this method.
3119          *
3120          * @param array $customAttribs Array of html attributes to use in the textarea
3121          * @param string $textoverride Optional text to override $this->textarea1 with
3122          */
3123         protected function showTextbox1( $customAttribs = null, $textoverride = null ) {
3124                 if ( $this->wasDeletedSinceLastEdit() && $this->formtype == 'save' ) {
3125                         $attribs = [ 'style' => 'display:none;' ];
3126                 } else {
3127                         $classes = []; // Textarea CSS
3128                         if ( $this->mTitle->isProtected( 'edit' ) &&
3129                                 MWNamespace::getRestrictionLevels( $this->mTitle->getNamespace() ) !== [ '' ]
3130                         ) {
3131                                 # Is the title semi-protected?
3132                                 if ( $this->mTitle->isSemiProtected() ) {
3133                                         $classes[] = 'mw-textarea-sprotected';
3134                                 } else {
3135                                         # Then it must be protected based on static groups (regular)
3136                                         $classes[] = 'mw-textarea-protected';
3137                                 }
3138                                 # Is the title cascade-protected?
3139                                 if ( $this->mTitle->isCascadeProtected() ) {
3140                                         $classes[] = 'mw-textarea-cprotected';
3141                                 }
3142                         }
3143
3144                         $attribs = [ 'tabindex' => 1 ];
3145
3146                         if ( is_array( $customAttribs ) ) {
3147                                 $attribs += $customAttribs;
3148                         }
3149
3150                         if ( count( $classes ) ) {
3151                                 if ( isset( $attribs['class'] ) ) {
3152                                         $classes[] = $attribs['class'];
3153                                 }
3154                                 $attribs['class'] = implode( ' ', $classes );
3155                         }
3156                 }
3157
3158                 $this->showTextbox(
3159                         $textoverride !== null ? $textoverride : $this->textbox1,
3160                         'wpTextbox1',
3161                         $attribs
3162                 );
3163         }
3164
3165         protected function showTextbox2() {
3166                 $this->showTextbox( $this->textbox2, 'wpTextbox2', [ 'tabindex' => 6, 'readonly' ] );
3167         }
3168
3169         protected function showTextbox( $text, $name, $customAttribs = [] ) {
3170                 global $wgOut, $wgUser;
3171
3172                 $wikitext = $this->safeUnicodeOutput( $text );
3173                 if ( strval( $wikitext ) !== '' ) {
3174                         // Ensure there's a newline at the end, otherwise adding lines
3175                         // is awkward.
3176                         // But don't add a newline if the ext is empty, or Firefox in XHTML
3177                         // mode will show an extra newline. A bit annoying.
3178                         $wikitext .= "\n";
3179                 }
3180
3181                 $attribs = $customAttribs + [
3182                         'accesskey' => ',',
3183                         'id' => $name,
3184                         'cols' => $wgUser->getIntOption( 'cols' ),
3185                         'rows' => $wgUser->getIntOption( 'rows' ),
3186                         // Avoid PHP notices when appending preferences
3187                         // (appending allows customAttribs['style'] to still work).
3188                         'style' => ''
3189                 ];
3190
3191                 $pageLang = $this->mTitle->getPageLanguage();
3192                 $attribs['lang'] = $pageLang->getHtmlCode();
3193                 $attribs['dir'] = $pageLang->getDir();
3194
3195                 $wgOut->addHTML( Html::textarea( $name, $wikitext, $attribs ) );
3196         }
3197
3198         protected function displayPreviewArea( $previewOutput, $isOnTop = false ) {
3199                 global $wgOut;
3200                 $classes = [];
3201                 if ( $isOnTop ) {
3202                         $classes[] = 'ontop';
3203                 }
3204
3205                 $attribs = [ 'id' => 'wikiPreview', 'class' => implode( ' ', $classes ) ];
3206
3207                 if ( $this->formtype != 'preview' ) {
3208                         $attribs['style'] = 'display: none;';
3209                 }
3210
3211                 $wgOut->addHTML( Xml::openElement( 'div', $attribs ) );
3212
3213                 if ( $this->formtype == 'preview' ) {
3214                         $this->showPreview( $previewOutput );
3215                 } else {
3216                         // Empty content container for LivePreview
3217                         $pageViewLang = $this->mTitle->getPageViewLanguage();
3218                         $attribs = [ 'lang' => $pageViewLang->getHtmlCode(), 'dir' => $pageViewLang->getDir(),
3219                                 'class' => 'mw-content-' . $pageViewLang->getDir() ];
3220                         $wgOut->addHTML( Html::rawElement( 'div', $attribs ) );
3221                 }
3222
3223                 $wgOut->addHTML( '</div>' );
3224
3225                 if ( $this->formtype == 'diff' ) {
3226                         try {
3227                                 $this->showDiff();
3228                         } catch ( MWContentSerializationException $ex ) {
3229                                 $msg = wfMessage(
3230                                         'content-failed-to-parse',
3231                                         $this->contentModel,
3232                                         $this->contentFormat,
3233                                         $ex->getMessage()
3234                                 );
3235                                 $wgOut->addWikiText( '<div class="error">' . $msg->text() . '</div>' );
3236                         }
3237                 }
3238         }
3239
3240         /**
3241          * Append preview output to $wgOut.
3242          * Includes category rendering if this is a category page.
3243          *
3244          * @param string $text The HTML to be output for the preview.
3245          */
3246         protected function showPreview( $text ) {
3247                 global $wgOut;
3248                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
3249                         $this->mArticle->openShowCategory();
3250                 }
3251                 # This hook seems slightly odd here, but makes things more
3252                 # consistent for extensions.
3253                 Hooks::run( 'OutputPageBeforeHTML', [ &$wgOut, &$text ] );
3254                 $wgOut->addHTML( $text );
3255                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
3256                         $this->mArticle->closeShowCategory();
3257                 }
3258         }
3259
3260         /**
3261          * Get a diff between the current contents of the edit box and the
3262          * version of the page we're editing from.
3263          *
3264          * If this is a section edit, we'll replace the section as for final
3265          * save and then make a comparison.
3266          */
3267         function showDiff() {
3268                 global $wgUser, $wgContLang, $wgOut;
3269
3270                 $oldtitlemsg = 'currentrev';
3271                 # if message does not exist, show diff against the preloaded default
3272                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI && !$this->mTitle->exists() ) {
3273                         $oldtext = $this->mTitle->getDefaultMessageText();
3274                         if ( $oldtext !== false ) {
3275                                 $oldtitlemsg = 'defaultmessagetext';
3276                                 $oldContent = $this->toEditContent( $oldtext );
3277                         } else {
3278                                 $oldContent = null;
3279                         }
3280                 } else {
3281                         $oldContent = $this->getCurrentContent();
3282                 }
3283
3284                 $textboxContent = $this->toEditContent( $this->textbox1 );
3285                 if ( $this->editRevId !== null ) {
3286                         $newContent = $this->page->replaceSectionAtRev(
3287                                 $this->section, $textboxContent, $this->summary, $this->editRevId
3288                         );
3289                 } else {
3290                         $newContent = $this->page->replaceSectionContent(
3291                                 $this->section, $textboxContent, $this->summary, $this->edittime
3292                         );
3293                 }
3294
3295                 if ( $newContent ) {
3296                         ContentHandler::runLegacyHooks( 'EditPageGetDiffText', [ $this, &$newContent ] );
3297                         Hooks::run( 'EditPageGetDiffContent', [ $this, &$newContent ] );
3298
3299                         $popts = ParserOptions::newFromUserAndLang( $wgUser, $wgContLang );
3300                         $newContent = $newContent->preSaveTransform( $this->mTitle, $wgUser, $popts );
3301                 }
3302
3303                 if ( ( $oldContent && !$oldContent->isEmpty() ) || ( $newContent && !$newContent->isEmpty() ) ) {
3304                         $oldtitle = wfMessage( $oldtitlemsg )->parse();
3305                         $newtitle = wfMessage( 'yourtext' )->parse();
3306
3307                         if ( !$oldContent ) {
3308                                 $oldContent = $newContent->getContentHandler()->makeEmptyContent();
3309                         }
3310
3311                         if ( !$newContent ) {
3312                                 $newContent = $oldContent->getContentHandler()->makeEmptyContent();
3313                         }
3314
3315                         $de = $oldContent->getContentHandler()->createDifferenceEngine( $this->mArticle->getContext() );
3316                         $de->setContent( $oldContent, $newContent );
3317
3318                         $difftext = $de->getDiff( $oldtitle, $newtitle );
3319                         $de->showDiffStyle();
3320                 } else {
3321                         $difftext = '';
3322                 }
3323
3324                 $wgOut->addHTML( '<div id="wikiDiff">' . $difftext . '</div>' );
3325         }
3326
3327         /**
3328          * Show the header copyright warning.
3329          */
3330         protected function showHeaderCopyrightWarning() {
3331                 $msg = 'editpage-head-copy-warn';
3332                 if ( !wfMessage( $msg )->isDisabled() ) {
3333                         global $wgOut;
3334                         $wgOut->wrapWikiMsg( "<div class='editpage-head-copywarn'>\n$1\n</div>",
3335                                 'editpage-head-copy-warn' );
3336                 }
3337         }
3338
3339         /**
3340          * Give a chance for site and per-namespace customizations of
3341          * terms of service summary link that might exist separately
3342          * from the copyright notice.
3343          *
3344          * This will display between the save button and the edit tools,
3345          * so should remain short!
3346          */
3347         protected function showTosSummary() {
3348                 $msg = 'editpage-tos-summary';
3349                 Hooks::run( 'EditPageTosSummary', [ $this->mTitle, &$msg ] );
3350                 if ( !wfMessage( $msg )->isDisabled() ) {
3351                         global $wgOut;
3352                         $wgOut->addHTML( '<div class="mw-tos-summary">' );
3353                         $wgOut->addWikiMsg( $msg );
3354                         $wgOut->addHTML( '</div>' );
3355                 }
3356         }
3357
3358         protected function showEditTools() {
3359                 global $wgOut;
3360                 $wgOut->addHTML( '<div class="mw-editTools">' .
3361                         wfMessage( 'edittools' )->inContentLanguage()->parse() .
3362                         '</div>' );
3363         }
3364
3365         /**
3366          * Get the copyright warning
3367          *
3368          * Renamed to getCopyrightWarning(), old name kept around for backwards compatibility
3369          * @return string
3370          */
3371         protected function getCopywarn() {
3372                 return self::getCopyrightWarning( $this->mTitle );
3373         }
3374
3375         /**
3376          * Get the copyright warning, by default returns wikitext
3377          *
3378          * @param Title $title
3379          * @param string $format Output format, valid values are any function of a Message object
3380          * @return string
3381          */
3382         public static function getCopyrightWarning( $title, $format = 'plain' ) {
3383                 global $wgRightsText;
3384                 if ( $wgRightsText ) {
3385                         $copywarnMsg = [ 'copyrightwarning',
3386                                 '[[' . wfMessage( 'copyrightpage' )->inContentLanguage()->text() . ']]',
3387                                 $wgRightsText ];
3388                 } else {
3389                         $copywarnMsg = [ 'copyrightwarning2',
3390                                 '[[' . wfMessage( 'copyrightpage' )->inContentLanguage()->text() . ']]' ];
3391                 }
3392                 // Allow for site and per-namespace customization of contribution/copyright notice.
3393                 Hooks::run( 'EditPageCopyrightWarning', [ $title, &$copywarnMsg ] );
3394
3395                 return "<div id=\"editpage-copywarn\">\n" .
3396                         call_user_func_array( 'wfMessage', $copywarnMsg )->$format() . "\n</div>";
3397         }
3398
3399         /**
3400          * Get the Limit report for page previews
3401          *
3402          * @since 1.22
3403          * @param ParserOutput $output ParserOutput object from the parse
3404          * @return string HTML
3405          */
3406         public static function getPreviewLimitReport( $output ) {
3407                 if ( !$output || !$output->getLimitReportData() ) {
3408                         return '';
3409                 }
3410
3411                 $limitReport = Html::rawElement( 'div', [ 'class' => 'mw-limitReportExplanation' ],
3412                         wfMessage( 'limitreport-title' )->parseAsBlock()
3413                 );
3414
3415                 // Show/hide animation doesn't work correctly on a table, so wrap it in a div.
3416                 $limitReport .= Html::openElement( 'div', [ 'class' => 'preview-limit-report-wrapper' ] );
3417
3418                 $limitReport .= Html::openElement( 'table', [
3419                         'class' => 'preview-limit-report wikitable'
3420                 ] ) .
3421                         Html::openElement( 'tbody' );
3422
3423                 foreach ( $output->getLimitReportData() as $key => $value ) {
3424                         if ( Hooks::run( 'ParserLimitReportFormat',
3425                                 [ $key, &$value, &$limitReport, true, true ]
3426                         ) ) {
3427                                 $keyMsg = wfMessage( $key );
3428                                 $valueMsg = wfMessage( [ "$key-value-html", "$key-value" ] );
3429                                 if ( !$valueMsg->exists() ) {
3430                                         $valueMsg = new RawMessage( '$1' );
3431                                 }
3432                                 if ( !$keyMsg->isDisabled() && !$valueMsg->isDisabled() ) {
3433                                         $limitReport .= Html::openElement( 'tr' ) .
3434                                                 Html::rawElement( 'th', null, $keyMsg->parse() ) .
3435                                                 Html::rawElement( 'td', null, $valueMsg->params( $value )->parse() ) .
3436                                                 Html::closeElement( 'tr' );
3437                                 }
3438                         }
3439                 }
3440
3441                 $limitReport .= Html::closeElement( 'tbody' ) .
3442                         Html::closeElement( 'table' ) .
3443                         Html::closeElement( 'div' );
3444
3445                 return $limitReport;
3446         }
3447
3448         protected function showStandardInputs( &$tabindex = 2 ) {
3449                 global $wgOut;
3450                 $wgOut->addHTML( "<div class='editOptions'>\n" );
3451
3452                 if ( $this->section != 'new' ) {
3453                         $this->showSummaryInput( false, $this->summary );
3454                         $wgOut->addHTML( $this->getSummaryPreview( false, $this->summary ) );
3455                 }
3456
3457                 $checkboxes = $this->getCheckboxes( $tabindex,
3458                         [ 'minor' => $this->minoredit, 'watch' => $this->watchthis ] );
3459                 $wgOut->addHTML( "<div class='editCheckboxes'>" . implode( $checkboxes, "\n" ) . "</div>\n" );
3460
3461                 // Show copyright warning.
3462                 $wgOut->addWikiText( $this->getCopywarn() );
3463                 $wgOut->addHTML( $this->editFormTextAfterWarn );
3464
3465                 $wgOut->addHTML( "<div class='editButtons'>\n" );
3466                 $wgOut->addHTML( implode( $this->getEditButtons( $tabindex ), "\n" ) . "\n" );
3467
3468                 $cancel = $this->getCancelLink();
3469                 if ( $cancel !== '' ) {
3470                         $cancel .= Html::element( 'span',
3471                                 [ 'class' => 'mw-editButtons-pipe-separator' ],
3472                                 wfMessage( 'pipe-separator' )->text() );
3473                 }
3474
3475                 $message = wfMessage( 'edithelppage' )->inContentLanguage()->text();
3476                 $edithelpurl = Skin::makeInternalOrExternalUrl( $message );
3477                 $attrs = [
3478                         'target' => 'helpwindow',
3479                         'href' => $edithelpurl,
3480                 ];
3481                 $edithelp = Html::linkButton( wfMessage( 'edithelp' )->text(),
3482                         $attrs, [ 'mw-ui-quiet' ] ) .
3483                         wfMessage( 'word-separator' )->escaped() .
3484                         wfMessage( 'newwindow' )->parse();
3485
3486                 $wgOut->addHTML( "      <span class='cancelLink'>{$cancel}</span>\n" );
3487                 $wgOut->addHTML( "      <span class='editHelp'>{$edithelp}</span>\n" );
3488                 $wgOut->addHTML( "</div><!-- editButtons -->\n" );
3489
3490                 Hooks::run( 'EditPage::showStandardInputs:options', [ $this, $wgOut, &$tabindex ] );
3491
3492                 $wgOut->addHTML( "</div><!-- editOptions -->\n" );
3493         }
3494
3495         /**
3496          * Show an edit conflict. textbox1 is already shown in showEditForm().
3497          * If you want to use another entry point to this function, be careful.
3498          */
3499         protected function showConflict() {
3500                 global $wgOut;
3501
3502                 if ( Hooks::run( 'EditPageBeforeConflictDiff', [ &$this, &$wgOut ] ) ) {
3503                         $stats = $wgOut->getContext()->getStats();
3504                         $stats->increment( 'edit.failures.conflict' );
3505
3506                         $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourdiff" );
3507
3508                         $content1 = $this->toEditContent( $this->textbox1 );
3509                         $content2 = $this->toEditContent( $this->textbox2 );
3510
3511                         $handler = ContentHandler::getForModelID( $this->contentModel );
3512                         $de = $handler->createDifferenceEngine( $this->mArticle->getContext() );
3513                         $de->setContent( $content2, $content1 );
3514                         $de->showDiff(
3515                                 wfMessage( 'yourtext' )->parse(),
3516                                 wfMessage( 'storedversion' )->text()
3517                         );
3518
3519                         $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourtext" );
3520                         $this->showTextbox2();
3521                 }
3522         }
3523
3524         /**
3525          * @return string
3526          */
3527         public function getCancelLink() {
3528                 $cancelParams = [];
3529                 if ( !$this->isConflict && $this->oldid > 0 ) {
3530                         $cancelParams['oldid'] = $this->oldid;
3531                 } elseif ( $this->getContextTitle()->isRedirect() ) {
3532                         $cancelParams['redirect'] = 'no';
3533                 }
3534                 $attrs = [ 'id' => 'mw-editform-cancel' ];
3535
3536                 return Linker::linkKnown(
3537                         $this->getContextTitle(),
3538                         wfMessage( 'cancel' )->parse(),
3539                         Html::buttonAttributes( $attrs, [ 'mw-ui-quiet' ] ),
3540                         $cancelParams
3541                 );
3542         }
3543
3544         /**
3545          * Returns the URL to use in the form's action attribute.
3546          * This is used by EditPage subclasses when simply customizing the action
3547          * variable in the constructor is not enough. This can be used when the
3548          * EditPage lives inside of a Special page rather than a custom page action.
3549          *
3550          * @param Title $title Title object for which is being edited (where we go to for &action= links)
3551          * @return string
3552          */
3553         protected function getActionURL( Title $title ) {
3554                 return $title->getLocalURL( [ 'action' => $this->action ] );
3555         }
3556
3557         /**
3558          * Check if a page was deleted while the user was editing it, before submit.
3559          * Note that we rely on the logging table, which hasn't been always there,
3560          * but that doesn't matter, because this only applies to brand new
3561          * deletes.
3562          * @return bool
3563          */
3564         protected function wasDeletedSinceLastEdit() {
3565                 if ( $this->deletedSinceEdit !== null ) {
3566                         return $this->deletedSinceEdit;
3567                 }
3568
3569                 $this->deletedSinceEdit = false;
3570
3571                 if ( !$this->mTitle->exists() && $this->mTitle->isDeletedQuick() ) {
3572                         $this->lastDelete = $this->getLastDelete();
3573                         if ( $this->lastDelete ) {
3574                                 $deleteTime = wfTimestamp( TS_MW, $this->lastDelete->log_timestamp );
3575                                 if ( $deleteTime > $this->starttime ) {
3576                                         $this->deletedSinceEdit = true;
3577                                 }
3578                         }
3579                 }
3580
3581                 return $this->deletedSinceEdit;
3582         }
3583
3584         /**
3585          * @return bool|stdClass
3586          */
3587         protected function getLastDelete() {
3588                 $dbr = wfGetDB( DB_SLAVE );
3589                 $data = $dbr->selectRow(
3590                         [ 'logging', 'user' ],
3591                         [
3592                                 'log_type',
3593                                 'log_action',
3594                                 'log_timestamp',
3595                                 'log_user',
3596                                 'log_namespace',
3597                                 'log_title',
3598                                 'log_comment',
3599                                 'log_params',
3600                                 'log_deleted',
3601                                 'user_name'
3602                         ], [
3603                                 'log_namespace' => $this->mTitle->getNamespace(),
3604                                 'log_title' => $this->mTitle->getDBkey(),
3605                                 'log_type' => 'delete',
3606                                 'log_action' => 'delete',
3607                                 'user_id=log_user'
3608                         ],
3609                         __METHOD__,
3610                         [ 'LIMIT' => 1, 'ORDER BY' => 'log_timestamp DESC' ]
3611                 );
3612                 // Quick paranoid permission checks...
3613                 if ( is_object( $data ) ) {
3614                         if ( $data->log_deleted & LogPage::DELETED_USER ) {
3615                                 $data->user_name = wfMessage( 'rev-deleted-user' )->escaped();
3616                         }
3617
3618                         if ( $data->log_deleted & LogPage::DELETED_COMMENT ) {
3619                                 $data->log_comment = wfMessage( 'rev-deleted-comment' )->escaped();
3620                         }
3621                 }
3622
3623                 return $data;
3624         }
3625
3626         /**
3627          * Get the rendered text for previewing.
3628          * @throws MWException
3629          * @return string
3630          */
3631         function getPreviewText() {
3632                 global $wgOut, $wgUser, $wgRawHtml, $wgLang;
3633                 global $wgAllowUserCss, $wgAllowUserJs, $wgAjaxEditStash;
3634
3635                 $stats = $wgOut->getContext()->getStats();
3636
3637                 if ( $wgRawHtml && !$this->mTokenOk ) {
3638                         // Could be an offsite preview attempt. This is very unsafe if
3639                         // HTML is enabled, as it could be an attack.
3640                         $parsedNote = '';
3641                         if ( $this->textbox1 !== '' ) {
3642                                 // Do not put big scary notice, if previewing the empty
3643                                 // string, which happens when you initially edit
3644                                 // a category page, due to automatic preview-on-open.
3645                                 $parsedNote = $wgOut->parse( "<div class='previewnote'>" .
3646                                         wfMessage( 'session_fail_preview_html' )->text() . "</div>", true, /* interface */true );
3647                         }
3648                         $stats->increment( 'edit.failures.session_loss' );
3649                         return $parsedNote;
3650                 }
3651
3652                 $note = '';
3653
3654                 try {
3655                         $content = $this->toEditContent( $this->textbox1 );
3656
3657                         $previewHTML = '';
3658                         if ( !Hooks::run(
3659                                 'AlternateEditPreview',
3660                                 [ $this, &$content, &$previewHTML, &$this->mParserOutput ] )
3661                         ) {
3662                                 return $previewHTML;
3663                         }
3664
3665                         # provide a anchor link to the editform
3666                         $continueEditing = '<span class="mw-continue-editing">' .
3667                                 '[[#' . self::EDITFORM_ID . '|' . $wgLang->getArrow() . ' ' .
3668                                 wfMessage( 'continue-editing' )->text() . ']]</span>';
3669                         if ( $this->mTriedSave && !$this->mTokenOk ) {
3670                                 if ( $this->mTokenOkExceptSuffix ) {
3671                                         $note = wfMessage( 'token_suffix_mismatch' )->plain();
3672                                         $stats->increment( 'edit.failures.bad_token' );
3673                                 } else {
3674                                         $note = wfMessage( 'session_fail_preview' )->plain();
3675                                         $stats->increment( 'edit.failures.session_loss' );
3676                                 }
3677                         } elseif ( $this->incompleteForm ) {
3678                                 $note = wfMessage( 'edit_form_incomplete' )->plain();
3679                                 if ( $this->mTriedSave ) {
3680                                         $stats->increment( 'edit.failures.incomplete_form' );
3681                                 }
3682                         } else {
3683                                 $note = wfMessage( 'previewnote' )->plain() . ' ' . $continueEditing;
3684                         }
3685
3686                         $parserOptions = $this->page->makeParserOptions( $this->mArticle->getContext() );
3687                         $parserOptions->setIsPreview( true );
3688                         $parserOptions->setIsSectionPreview( !is_null( $this->section ) && $this->section !== '' );
3689
3690                         # don't parse non-wikitext pages, show message about preview
3691                         if ( $this->mTitle->isCssJsSubpage() || $this->mTitle->isCssOrJsPage() ) {
3692                                 if ( $this->mTitle->isCssJsSubpage() ) {
3693                                         $level = 'user';
3694                                 } elseif ( $this->mTitle->isCssOrJsPage() ) {
3695                                         $level = 'site';
3696                                 } else {
3697                                         $level = false;
3698                                 }
3699
3700                                 if ( $content->getModel() == CONTENT_MODEL_CSS ) {
3701                                         $format = 'css';
3702                                         if ( $level === 'user' && !$wgAllowUserCss ) {
3703                                                 $format = false;
3704                                         }
3705                                 } elseif ( $content->getModel() == CONTENT_MODEL_JAVASCRIPT ) {
3706                                         $format = 'js';
3707                                         if ( $level === 'user' && !$wgAllowUserJs ) {
3708                                                 $format = false;
3709                                         }
3710                                 } else {
3711                                         $format = false;
3712                                 }
3713
3714                                 # Used messages to make sure grep find them:
3715                                 # Messages: usercsspreview, userjspreview, sitecsspreview, sitejspreview
3716                                 if ( $level && $format ) {
3717                                         $note = "<div id='mw-{$level}{$format}preview'>" .
3718                                                 wfMessage( "{$level}{$format}preview" )->text() .
3719                                                 ' ' . $continueEditing . "</div>";
3720                                 }
3721                         }
3722
3723                         # If we're adding a comment, we need to show the
3724                         # summary as the headline
3725                         if ( $this->section === "new" && $this->summary !== "" ) {
3726                                 $content = $content->addSectionHeader( $this->summary );
3727                         }
3728
3729                         $hook_args = [ $this, &$content ];
3730                         ContentHandler::runLegacyHooks( 'EditPageGetPreviewText', $hook_args );
3731                         Hooks::run( 'EditPageGetPreviewContent', $hook_args );
3732
3733                         $parserOptions->enableLimitReport();
3734
3735                         # For CSS/JS pages, we should have called the ShowRawCssJs hook here.
3736                         # But it's now deprecated, so never mind
3737
3738                         $pstContent = $content->preSaveTransform( $this->mTitle, $wgUser, $parserOptions );
3739                         $scopedCallback = $parserOptions->setupFakeRevision(
3740                                 $this->mTitle, $pstContent, $wgUser );
3741                         $parserOutput = $pstContent->getParserOutput( $this->mTitle, null, $parserOptions );
3742
3743                         # Try to stash the edit for the final submission step
3744                         # @todo: different date format preferences cause cache misses
3745                         if ( $wgAjaxEditStash ) {
3746                                 ApiStashEdit::stashEditFromPreview(
3747                                         $this->getArticle(), $content, $pstContent,
3748                                         $parserOutput, $parserOptions, $parserOptions, wfTimestampNow()
3749                                 );
3750                         }
3751
3752                         $parserOutput->setEditSectionTokens( false ); // no section edit links
3753                         $previewHTML = $parserOutput->getText();
3754                         $this->mParserOutput = $parserOutput;
3755                         $wgOut->addParserOutputMetadata( $parserOutput );
3756
3757                         if ( count( $parserOutput->getWarnings() ) ) {
3758                                 $note .= "\n\n" . implode( "\n\n", $parserOutput->getWarnings() );
3759                         }
3760
3761                         ScopedCallback::consume( $scopedCallback );
3762                 } catch ( MWContentSerializationException $ex ) {
3763                         $m = wfMessage(
3764                                 'content-failed-to-parse',
3765                                 $this->contentModel,
3766                                 $this->contentFormat,
3767                                 $ex->getMessage()
3768                         );
3769                         $note .= "\n\n" . $m->parse();
3770                         $previewHTML = '';
3771                 }
3772
3773                 if ( $this->isConflict ) {
3774                         $conflict = '<h2 id="mw-previewconflict">'
3775                                 . wfMessage( 'previewconflict' )->escaped() . "</h2>\n";
3776                 } else {
3777                         $conflict = '<hr />';
3778                 }
3779
3780                 $previewhead = "<div class='previewnote'>\n" .
3781                         '<h2 id="mw-previewheader">' . wfMessage( 'preview' )->escaped() . "</h2>" .
3782                         $wgOut->parse( $note, true, /* interface */true ) . $conflict . "</div>\n";
3783
3784                 $pageViewLang = $this->mTitle->getPageViewLanguage();
3785                 $attribs = [ 'lang' => $pageViewLang->getHtmlCode(), 'dir' => $pageViewLang->getDir(),
3786                         'class' => 'mw-content-' . $pageViewLang->getDir() ];
3787                 $previewHTML = Html::rawElement( 'div', $attribs, $previewHTML );
3788
3789                 return $previewhead . $previewHTML . $this->previewTextAfterContent;
3790         }
3791
3792         /**
3793          * @return array
3794          */
3795         function getTemplates() {
3796                 if ( $this->preview || $this->section != '' ) {
3797                         $templates = [];
3798                         if ( !isset( $this->mParserOutput ) ) {
3799                                 return $templates;
3800                         }
3801                         foreach ( $this->mParserOutput->getTemplates() as $ns => $template ) {
3802                                 foreach ( array_keys( $template ) as $dbk ) {
3803                                         $templates[] = Title::makeTitle( $ns, $dbk );
3804                                 }
3805                         }
3806                         return $templates;
3807                 } else {
3808                         return $this->mTitle->getTemplateLinksFrom();
3809                 }
3810         }
3811
3812         /**
3813          * Shows a bulletin board style toolbar for common editing functions.
3814          * It can be disabled in the user preferences.
3815          *
3816          * @param Title $title Title object for the page being edited (optional)
3817          * @return string
3818          */
3819         static function getEditToolbar( $title = null ) {
3820                 global $wgContLang, $wgOut;
3821                 global $wgEnableUploads, $wgForeignFileRepos;
3822
3823                 $imagesAvailable = $wgEnableUploads || count( $wgForeignFileRepos );
3824                 $showSignature = true;
3825                 if ( $title ) {
3826                         $showSignature = MWNamespace::wantSignatures( $title->getNamespace() );
3827                 }
3828
3829                 /**
3830                  * $toolarray is an array of arrays each of which includes the
3831                  * opening tag, the closing tag, optionally a sample text that is
3832                  * inserted between the two when no selection is highlighted
3833                  * and.  The tip text is shown when the user moves the mouse
3834                  * over the button.
3835                  *
3836                  * Images are defined in ResourceLoaderEditToolbarModule.
3837                  */
3838                 $toolarray = [
3839                         [
3840                                 'id'     => 'mw-editbutton-bold',
3841                                 'open'   => '\'\'\'',
3842                                 'close'  => '\'\'\'',
3843                                 'sample' => wfMessage( 'bold_sample' )->text(),
3844                                 'tip'    => wfMessage( 'bold_tip' )->text(),
3845                         ],
3846                         [
3847                                 'id'     => 'mw-editbutton-italic',
3848                                 'open'   => '\'\'',
3849                                 'close'  => '\'\'',
3850                                 'sample' => wfMessage( 'italic_sample' )->text(),
3851                                 'tip'    => wfMessage( 'italic_tip' )->text(),
3852                         ],
3853                         [
3854                                 'id'     => 'mw-editbutton-link',
3855                                 'open'   => '[[',
3856                                 'close'  => ']]',
3857                                 'sample' => wfMessage( 'link_sample' )->text(),
3858                                 'tip'    => wfMessage( 'link_tip' )->text(),
3859                         ],
3860                         [
3861                                 'id'     => 'mw-editbutton-extlink',
3862                                 'open'   => '[',
3863                                 'close'  => ']',
3864                                 'sample' => wfMessage( 'extlink_sample' )->text(),
3865                                 'tip'    => wfMessage( 'extlink_tip' )->text(),
3866                         ],
3867                         [
3868                                 'id'     => 'mw-editbutton-headline',
3869                                 'open'   => "\n== ",
3870                                 'close'  => " ==\n",
3871                                 'sample' => wfMessage( 'headline_sample' )->text(),
3872                                 'tip'    => wfMessage( 'headline_tip' )->text(),
3873                         ],
3874                         $imagesAvailable ? [
3875                                 'id'     => 'mw-editbutton-image',
3876                                 'open'   => '[[' . $wgContLang->getNsText( NS_FILE ) . ':',
3877                                 'close'  => ']]',
3878                                 'sample' => wfMessage( 'image_sample' )->text(),
3879                                 'tip'    => wfMessage( 'image_tip' )->text(),
3880                         ] : false,
3881                         $imagesAvailable ? [
3882                                 'id'     => 'mw-editbutton-media',
3883                                 'open'   => '[[' . $wgContLang->getNsText( NS_MEDIA ) . ':',
3884                                 'close'  => ']]',
3885                                 'sample' => wfMessage( 'media_sample' )->text(),
3886                                 'tip'    => wfMessage( 'media_tip' )->text(),
3887                         ] : false,
3888                         [
3889                                 'id'     => 'mw-editbutton-nowiki',
3890                                 'open'   => "<nowiki>",
3891                                 'close'  => "</nowiki>",
3892                                 'sample' => wfMessage( 'nowiki_sample' )->text(),
3893                                 'tip'    => wfMessage( 'nowiki_tip' )->text(),
3894                         ],
3895                         $showSignature ? [
3896                                 'id'     => 'mw-editbutton-signature',
3897                                 'open'   => wfMessage( 'sig-text', '~~~~' )->inContentLanguage()->text(),
3898                                 'close'  => '',
3899                                 'sample' => '',
3900                                 'tip'    => wfMessage( 'sig_tip' )->text(),
3901                         ] : false,
3902                         [
3903                                 'id'     => 'mw-editbutton-hr',
3904                                 'open'   => "\n----\n",
3905                                 'close'  => '',
3906                                 'sample' => '',
3907                                 'tip'    => wfMessage( 'hr_tip' )->text(),
3908                         ]
3909                 ];
3910
3911                 $script = 'mw.loader.using("mediawiki.toolbar", function () {';
3912                 foreach ( $toolarray as $tool ) {
3913                         if ( !$tool ) {
3914                                 continue;
3915                         }
3916
3917                         $params = [
3918                                 // Images are defined in ResourceLoaderEditToolbarModule
3919                                 false,
3920                                 // Note that we use the tip both for the ALT tag and the TITLE tag of the image.
3921                                 // Older browsers show a "speedtip" type message only for ALT.
3922                                 // Ideally these should be different, realistically they
3923                                 // probably don't need to be.
3924                                 $tool['tip'],
3925                                 $tool['open'],
3926                                 $tool['close'],
3927                                 $tool['sample'],
3928                                 $tool['id'],
3929                         ];
3930
3931                         $script .= Xml::encodeJsCall(
3932                                 'mw.toolbar.addButton',
3933                                 $params,
3934                                 ResourceLoader::inDebugMode()
3935                         );
3936                 }
3937
3938                 $script .= '});';
3939                 $wgOut->addScript( ResourceLoader::makeInlineScript( $script ) );
3940
3941                 $toolbar = '<div id="toolbar"></div>';
3942
3943                 Hooks::run( 'EditPageBeforeEditToolbar', [ &$toolbar ] );
3944
3945                 return $toolbar;
3946         }
3947
3948         /**
3949          * Returns an array of html code of the following checkboxes:
3950          * minor and watch
3951          *
3952          * @param int $tabindex Current tabindex
3953          * @param array $checked Array of checkbox => bool, where bool indicates the checked
3954          *                 status of the checkbox
3955          *
3956          * @return array
3957          */
3958         public function getCheckboxes( &$tabindex, $checked ) {
3959                 global $wgUser, $wgUseMediaWikiUIEverywhere;
3960
3961                 $checkboxes = [];
3962
3963                 // don't show the minor edit checkbox if it's a new page or section
3964                 if ( !$this->isNew ) {
3965                         $checkboxes['minor'] = '';
3966                         $minorLabel = wfMessage( 'minoredit' )->parse();
3967                         if ( $wgUser->isAllowed( 'minoredit' ) ) {
3968                                 $attribs = [
3969                                         'tabindex' => ++$tabindex,
3970                                         'accesskey' => wfMessage( 'accesskey-minoredit' )->text(),
3971                                         'id' => 'wpMinoredit',
3972                                 ];
3973                                 $minorEditHtml =
3974                                         Xml::check( 'wpMinoredit', $checked['minor'], $attribs ) .
3975                                         "&#160;<label for='wpMinoredit' id='mw-editpage-minoredit'" .
3976                                         Xml::expandAttributes( [ 'title' => Linker::titleAttrib( 'minoredit', 'withaccess' ) ] ) .
3977                                         ">{$minorLabel}</label>";
3978
3979                                 if ( $wgUseMediaWikiUIEverywhere ) {
3980                                         $checkboxes['minor'] = Html::openElement( 'div', [ 'class' => 'mw-ui-checkbox' ] ) .
3981                                                 $minorEditHtml .
3982                                         Html::closeElement( 'div' );
3983                                 } else {
3984                                         $checkboxes['minor'] = $minorEditHtml;
3985                                 }
3986                         }
3987                 }
3988
3989                 $watchLabel = wfMessage( 'watchthis' )->parse();
3990                 $checkboxes['watch'] = '';
3991                 if ( $wgUser->isLoggedIn() ) {
3992                         $attribs = [
3993                                 'tabindex' => ++$tabindex,
3994                                 'accesskey' => wfMessage( 'accesskey-watch' )->text(),
3995                                 'id' => 'wpWatchthis',
3996                         ];
3997                         $watchThisHtml =
3998                                 Xml::check( 'wpWatchthis', $checked['watch'], $attribs ) .
3999                                 "&#160;<label for='wpWatchthis' id='mw-editpage-watch'" .
4000                                 Xml::expandAttributes( [ 'title' => Linker::titleAttrib( 'watch', 'withaccess' ) ] ) .
4001                                 ">{$watchLabel}</label>";
4002                         if ( $wgUseMediaWikiUIEverywhere ) {
4003                                 $checkboxes['watch'] = Html::openElement( 'div', [ 'class' => 'mw-ui-checkbox' ] ) .
4004                                         $watchThisHtml .
4005                                         Html::closeElement( 'div' );
4006                         } else {
4007                                 $checkboxes['watch'] = $watchThisHtml;
4008                         }
4009                 }
4010                 Hooks::run( 'EditPageBeforeEditChecks', [ &$this, &$checkboxes, &$tabindex ] );
4011                 return $checkboxes;
4012         }
4013
4014         /**
4015          * Returns an array of html code of the following buttons:
4016          * save, diff, preview and live
4017          *
4018          * @param int $tabindex Current tabindex
4019          *
4020          * @return array
4021          */
4022         public function getEditButtons( &$tabindex ) {
4023                 $buttons = [];
4024
4025                 $attribs = [
4026                         'id' => 'wpSave',
4027                         'name' => 'wpSave',
4028                         'tabindex' => ++$tabindex,
4029                 ] + Linker::tooltipAndAccesskeyAttribs( 'save' );
4030                 $buttons['save'] = Html::submitButton( wfMessage( 'savearticle' )->text(),
4031                         $attribs, [ 'mw-ui-constructive' ] );
4032
4033                 ++$tabindex; // use the same for preview and live preview
4034                 $attribs = [
4035                         'id' => 'wpPreview',
4036                         'name' => 'wpPreview',
4037                         'tabindex' => $tabindex,
4038                 ] + Linker::tooltipAndAccesskeyAttribs( 'preview' );
4039                 $buttons['preview'] = Html::submitButton( wfMessage( 'showpreview' )->text(),
4040                         $attribs );
4041                 $buttons['live'] = '';
4042
4043                 $attribs = [
4044                         'id' => 'wpDiff',
4045                         'name' => 'wpDiff',
4046                         'tabindex' => ++$tabindex,
4047                 ] + Linker::tooltipAndAccesskeyAttribs( 'diff' );
4048                 $buttons['diff'] = Html::submitButton( wfMessage( 'showdiff' )->text(),
4049                         $attribs );
4050
4051                 Hooks::run( 'EditPageBeforeEditButtons', [ &$this, &$buttons, &$tabindex ] );
4052                 return $buttons;
4053         }
4054
4055         /**
4056          * Creates a basic error page which informs the user that
4057          * they have attempted to edit a nonexistent section.
4058          */
4059         function noSuchSectionPage() {
4060                 global $wgOut;
4061
4062                 $wgOut->prepareErrorPage( wfMessage( 'nosuchsectiontitle' ) );
4063
4064                 $res = wfMessage( 'nosuchsectiontext', $this->section )->parseAsBlock();
4065                 Hooks::run( 'EditPageNoSuchSection', [ &$this, &$res ] );
4066                 $wgOut->addHTML( $res );
4067
4068                 $wgOut->returnToMain( false, $this->mTitle );
4069         }
4070
4071         /**
4072          * Show "your edit contains spam" page with your diff and text
4073          *
4074          * @param string|array|bool $match Text (or array of texts) which triggered one or more filters
4075          */
4076         public function spamPageWithContent( $match = false ) {
4077                 global $wgOut, $wgLang;
4078                 $this->textbox2 = $this->textbox1;
4079
4080                 if ( is_array( $match ) ) {
4081                         $match = $wgLang->listToText( $match );
4082                 }
4083                 $wgOut->prepareErrorPage( wfMessage( 'spamprotectiontitle' ) );
4084
4085                 $wgOut->addHTML( '<div id="spamprotected">' );
4086                 $wgOut->addWikiMsg( 'spamprotectiontext' );
4087                 if ( $match ) {
4088                         $wgOut->addWikiMsg( 'spamprotectionmatch', wfEscapeWikiText( $match ) );
4089                 }
4090                 $wgOut->addHTML( '</div>' );
4091
4092                 $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourdiff" );
4093                 $this->showDiff();
4094
4095                 $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourtext" );
4096                 $this->showTextbox2();
4097
4098                 $wgOut->addReturnTo( $this->getContextTitle(), [ 'action' => 'edit' ] );
4099         }
4100
4101         /**
4102          * Check if the browser is on a blacklist of user-agents known to
4103          * mangle UTF-8 data on form submission. Returns true if Unicode
4104          * should make it through, false if it's known to be a problem.
4105          * @return bool
4106          */
4107         private function checkUnicodeCompliantBrowser() {
4108                 global $wgBrowserBlackList, $wgRequest;
4109
4110                 $currentbrowser = $wgRequest->getHeader( 'User-Agent' );
4111                 if ( $currentbrowser === false ) {
4112                         // No User-Agent header sent? Trust it by default...
4113                         return true;
4114                 }
4115
4116                 foreach ( $wgBrowserBlackList as $browser ) {
4117                         if ( preg_match( $browser, $currentbrowser ) ) {
4118                                 return false;
4119                         }
4120                 }
4121                 return true;
4122         }
4123
4124         /**
4125          * Filter an input field through a Unicode de-armoring process if it
4126          * came from an old browser with known broken Unicode editing issues.
4127          *
4128          * @param WebRequest $request
4129          * @param string $field
4130          * @return string
4131          */
4132         protected function safeUnicodeInput( $request, $field ) {
4133                 $text = rtrim( $request->getText( $field ) );
4134                 return $request->getBool( 'safemode' )
4135                         ? $this->unmakeSafe( $text )
4136                         : $text;
4137         }
4138
4139         /**
4140          * Filter an output field through a Unicode armoring process if it is
4141          * going to an old browser with known broken Unicode editing issues.
4142          *
4143          * @param string $text
4144          * @return string
4145          */
4146         protected function safeUnicodeOutput( $text ) {
4147                 global $wgContLang;
4148                 $codedText = $wgContLang->recodeForEdit( $text );
4149                 return $this->checkUnicodeCompliantBrowser()
4150                         ? $codedText
4151                         : $this->makeSafe( $codedText );
4152         }
4153
4154         /**
4155          * A number of web browsers are known to corrupt non-ASCII characters
4156          * in a UTF-8 text editing environment. To protect against this,
4157          * detected browsers will be served an armored version of the text,
4158          * with non-ASCII chars converted to numeric HTML character references.
4159          *
4160          * Preexisting such character references will have a 0 added to them
4161          * to ensure that round-trips do not alter the original data.
4162          *
4163          * @param string $invalue
4164          * @return string
4165          */
4166         private function makeSafe( $invalue ) {
4167                 // Armor existing references for reversibility.
4168                 $invalue = strtr( $invalue, [ "&#x" => "&#x0" ] );
4169
4170                 $bytesleft = 0;
4171                 $result = "";
4172                 $working = 0;
4173                 $valueLength = strlen( $invalue );
4174                 for ( $i = 0; $i < $valueLength; $i++ ) {
4175                         $bytevalue = ord( $invalue[$i] );
4176                         if ( $bytevalue <= 0x7F ) { // 0xxx xxxx
4177                                 $result .= chr( $bytevalue );
4178                                 $bytesleft = 0;
4179                         } elseif ( $bytevalue <= 0xBF ) { // 10xx xxxx
4180                                 $working = $working << 6;
4181                                 $working += ( $bytevalue & 0x3F );
4182                                 $bytesleft--;
4183                                 if ( $bytesleft <= 0 ) {
4184                                         $result .= "&#x" . strtoupper( dechex( $working ) ) . ";";
4185                                 }
4186                         } elseif ( $bytevalue <= 0xDF ) { // 110x xxxx
4187                                 $working = $bytevalue & 0x1F;
4188                                 $bytesleft = 1;
4189                         } elseif ( $bytevalue <= 0xEF ) { // 1110 xxxx
4190                                 $working = $bytevalue & 0x0F;
4191                                 $bytesleft = 2;
4192                         } else { // 1111 0xxx
4193                                 $working = $bytevalue & 0x07;
4194                                 $bytesleft = 3;
4195                         }
4196                 }
4197                 return $result;
4198         }
4199
4200         /**
4201          * Reverse the previously applied transliteration of non-ASCII characters
4202          * back to UTF-8. Used to protect data from corruption by broken web browsers
4203          * as listed in $wgBrowserBlackList.
4204          *
4205          * @param string $invalue
4206          * @return string
4207          */
4208         private function unmakeSafe( $invalue ) {
4209                 $result = "";
4210                 $valueLength = strlen( $invalue );
4211                 for ( $i = 0; $i < $valueLength; $i++ ) {
4212                         if ( ( substr( $invalue, $i, 3 ) == "&#x" ) && ( $invalue[$i + 3] != '0' ) ) {
4213                                 $i += 3;
4214                                 $hexstring = "";
4215                                 do {
4216                                         $hexstring .= $invalue[$i];
4217                                         $i++;
4218                                 } while ( ctype_xdigit( $invalue[$i] ) && ( $i < strlen( $invalue ) ) );
4219
4220                                 // Do some sanity checks. These aren't needed for reversibility,
4221                                 // but should help keep the breakage down if the editor
4222                                 // breaks one of the entities whilst editing.
4223                                 if ( ( substr( $invalue, $i, 1 ) == ";" ) && ( strlen( $hexstring ) <= 6 ) ) {
4224                                         $codepoint = hexdec( $hexstring );
4225                                         $result .= UtfNormal\Utils::codepointToUtf8( $codepoint );
4226                                 } else {
4227                                         $result .= "&#x" . $hexstring . substr( $invalue, $i, 1 );
4228                                 }
4229                         } else {
4230                                 $result .= substr( $invalue, $i, 1 );
4231                         }
4232                 }
4233                 // reverse the transform that we made for reversibility reasons.
4234                 return strtr( $result, [ "&#x0" => "&#x" ] );
4235         }
4236 }